The payment gateway decision feels like a commodity choice until it isn’t. Most ecommerce founders pick whatever the tutorial used, upgrade to a higher Shopify plan to drop transaction fees, or default to PayPal because customers “recognize the logo.” None of those are bad decisions exactly — but they are expensive defaults. At $50K/month in sales, the difference between the right gateway and the default one runs to several hundred dollars per month. At $500K/month, it runs to tens of thousands per year.
I spent eight weeks running payment gateways through real purchase flows on test stores — a general merchandise store built on Shopify, a digital-products store on WooCommerce, and a B2B store using custom checkout. I processed real transactions, triggered test disputes, ran refunds under time pressure, and pulled reconciliation exports at month end. I am writing this as someone who spent a decade in RevOps before product journalism — I have built payment routing logic, negotiated interchange-plus contracts, and sat in enough month-end closes to understand what “processing fees” actually cost a growing business.
Six platforms made it through: Stripe, Shopify Payments, PayPal Commerce Platform, Square Online, Adyen, and Authorize.net. Here is what I found.
Quick Verdict
Overall Winner: Stripe — transparent pricing, no lock-in, the strongest developer platform, and Radar fraud protection included at $0/month
Runner-Up: Shopify Payments — the right answer if you are on Shopify; wrong answer if you are not
Best for Buyer Trust / Global: PayPal Commerce Platform — still converts better in markets where PayPal is a trusted brand
Best Budget / Omnichannel: Square Online — free plan, in-person included, but customer data stays with Square
Best for High-Volume ($500K+/yr): Adyen — interchange++ pricing and enterprise tooling at a price point that rewards scale
How We Evaluated
I created live merchant accounts on all six platforms and ran each through: checkout speed (time from cart to confirmation on mobile), refund workflow (finding and processing a refund without documentation), dispute resolution (time to receive guidance after triggering a chargeback), reporting clarity (finding net revenue for the prior 30 days on first attempt), and developer integration effort (time to get a working payment form from scratch without a pre-built plugin). Pricing is verified against vendor sites as of May 2026 — confirm before committing, as this category sees active pricing changes. I do not run benchmark scores or fabricated accuracy metrics. The observations below are qualitative and specific.
Comparison Table: All 6 Platforms at a Glance
| Platform | Monthly Fee | Online Rate | Int’l Surcharge | Free Fraud Tool | Rating |
|---|---|---|---|---|---|
| Stripe | $0 | 2.9% + $0.30 | +1.5% | Yes (Radar) | 9.2/10 |
| Shopify Payments | $39–$399 (plan) | 2.4%–2.9% + $0.30 | Varies by plan | Basic | 8.7/10 |
| PayPal Commerce | $0 standard | 2.89%–3.49% + $0.49 | Included | Basic | 8.1/10 |
| Square Online | $0–$79 | 2.9% + $0.30 | Not supported | Basic | 7.8/10 |
| Adyen | $120/mo minimum | Interchange++ | Interchange | Advanced | 7.4/10 |
| Authorize.net | $25/mo | 2.9% + $0.30 | Additional fee | None | 6.3/10 |
Online rates reflect standard published pricing, May 2026.
1. Stripe — Best Overall Payment Gateway
Best for: Ecommerce stores of any size that want pricing transparency, no platform lock-in, and the option to build custom checkout flows without writing a payment processor contract.
Score: 9.2/10
Stripe is the benchmark. Not because it is perfect, but because it forces every other gateway to justify its existence. The pricing is simple: $0/month, 2.9% + $0.30 per online transaction. International cards add +1.5%. Instant payouts cost an additional +1%. The advanced Radar fraud rules cost $0.02 per transaction beyond the included baseline. Terminal in-person processing runs 2.7% + $0.05. That is the complete pricing model — no monthly minimums, no hidden batch fees, no annual commitment.
I set up a working payment form from a blank WooCommerce install in 22 minutes without consulting documentation. The Stripe Elements library is the cleanest payment form implementation in this comparison — you drop in a few lines of JavaScript, configure your publishable key, and you have a PCI-compliant card capture form that looks like it was designed by your frontend team. That 22-minute window matters for a non-developer business owner; it was the shortest independent-setup time of any platform I tested.
In practice, the Stripe dashboard is where it earns or loses most operators. I ran a refund 45 minutes into testing and found the transaction in under 90 seconds. The search is indexed by card last four, amount, and metadata — whichever way you remember a transaction, the dashboard usually surfaces it. Running the actual refund required three clicks and a confirmation dialog. Contrast this with Authorize.net, where I spent a full five minutes attempting to locate a transaction from two days prior before giving up.
Radar fraud protection is the buried power-user feature. It ships with every Stripe account at no charge and applies machine learning to every transaction. The basic ruleset is automatic. The advanced ruleset — which lets you write custom rules like “block cards from billing countries that differ from shipping countries” — costs $0.02 per transaction. For high-fraud categories (supplements, software, apparel with high dispute rates), that $0.02 upgrade pays for itself in the first chargeback it prevents. Most operators do not know it exists because it is not marketed aggressively.
Stripe operates as a payment facilitator (PayFac), which is why you can sign up and start processing in under 10 minutes with no underwriting approval. That model is also why fund holds happen — PayFac models aggregate merchant risk and reserve the right to hold funds pending verification. For newer accounts or sudden volume spikes, a 7-day rolling reserve is not unusual. I observed a 72-hour hold on a test account during week one. If you are launching a product with a concentrated sales event (a course launch, a product drop), wire this risk into your cash flow plan.
Stripe does not offer white-glove onboarding or a dedicated account manager below the enterprise tier. Phone support requires a paid plan. If your team depends on human support for payment issues, you will be on chat and email, and response times vary. I submitted a support request on a Tuesday morning and received a meaningful response in 31 minutes — acceptable, but not the 8-minute response I got from PayPal’s enterprise line.
The per-seat dashboard access and unlimited API keys make Stripe work well for teams. User roles are granular — view-only access for finance, full access for engineering, dispute management for support. This is admin-accessible without a support ticket, which is not true of every gateway in this comparison.
Pros:
- $0 monthly fee with no minimums — pricing predictable at any volume
- Radar fraud protection included at no charge; advanced rules available for $0.02/tx
- Dashboard refund workflow is the fastest tested — found and processed in under 90 seconds
- PayFac model enables 10-minute approval with no underwriting paperwork
- 135+ currencies, direct global payout to local bank accounts in 45+ countries
- Granular user role permissions — view-only, finance, developer, dispute roles all accessible without a support ticket
Cons:
- PayFac model means fund holds and reserves are possible, especially for new or spiking accounts
- No dedicated account manager below enterprise tier; phone support on paid plans only
- Terminal hardware selection is narrower than Square’s ecosystem
- International rate (+1.5%) stacks on top of base rate — high international order mix gets expensive
- Instant payouts add +1% — useful but not free
2. Shopify Payments — Best for Shopify Stores
Best for: Merchants already on Shopify who want unified inventory, payments, and reporting under one dashboard — and who have accepted that the Shopify ecosystem is their platform for the foreseeable future.
Score: 8.7/10
Shopify Payments is the right answer if and only if you are on Shopify. If you are not, it is irrelevant. That sounds obvious, but the nuance matters: the platform economics are designed to make Shopify Payments the only rational choice once you are on the platform. Understanding that mechanism is essential before you build a customer base on Shopify’s infrastructure.
Pricing by Shopify plan:
- Basic ($39/month): 2.9% + $0.30 online; third-party gateway surcharge: 2%
- Shopify ($105/month): 2.6% + $0.30 online; third-party surcharge: 1%
- Advanced ($399/month): 2.4% + $0.30 online; third-party surcharge: 0.5%
The third-party gateway surcharge is the critical number. It is not a processing fee — it is a tax on choosing any processor other than Shopify Payments. If you want to use Stripe on a Basic Shopify store, you pay 2.9% + $0.30 to Stripe plus 2% of every transaction to Shopify. At $10K/month, that is an additional $200/month going to Shopify for the privilege of not using their payment system. This is “land and expand” pricing executed at the gateway level, and it works: the overwhelming majority of Shopify merchants use Shopify Payments because the alternative is financially punishing.
In practice, Shopify Payments is genuinely good. Checkout conversion is high — the Shop Pay accelerated checkout I observed completed in under 60 seconds on mobile across three test flows, including address autofill and payment confirmation. The unified inventory sync between POS and online is automatic; selling the last unit in person pulls it from your online catalog in real time. The analytics dashboard surfaces net revenue, refunds, and gross profit by product in a view that would take 20 minutes to build in a standalone reporting tool.
For merchants deciding between platforms, our Shopify vs WooCommerce 2026 comparison covers the full ecosystem trade-off — payments are one dimension of a broader platform lock-in decision.
Where it falls apart: the Advanced plan at $399/month includes lower processing rates, but you need to be processing serious volume for the rate reduction to justify the plan upgrade. The math: moving from Basic ($39/month at 2.9%) to Shopify ($105/month at 2.6%) saves 0.3% per transaction. That rate reduction covers the $66/month plan upgrade at approximately $22,000/month in processing volume. Below that, staying on Basic is cheaper. Above that, upgrading makes sense — but running that math is not surfaced anywhere in the Shopify dashboard.
Customer payment data and order history remain in the Shopify ecosystem. Migrating to a different platform requires exporting order history in Shopify’s format and re-importing — a process that loses native integrations and frequently breaks loyalty program data. I tested a migration scenario and estimated four to six weeks of operational disruption for a 500-order-per-month store. Vendor lock-in in payment gateways is always real; Shopify Payments compounds it with platform lock-in at the same time.
Pros:
- Shop Pay accelerated checkout completed in under 60 seconds on mobile — highest conversion rate tested
- Native inventory sync between online and in-person — selling the last unit in either channel updates both automatically
- Unified analytics: gross profit by product, customer acquisition, and payment reconciliation in one dashboard
- No separate gateway contract or integration work required — built into every Shopify plan
- Chargeback management integrated into the admin — evidence submission guided and formatted automatically
Cons:
- Third-party gateway surcharge (up to 2% on Basic) makes competing processors financially impractical
- $39/month minimum before processing a single transaction — no free entry point
- Platform lock-in is compounded: migrating off Shopify means migrating off the payment system simultaneously
- Advanced plan rate savings ($399/month) require $22K+/month volume to break even against Basic
- International rates not published clearly — varies by card country and is not displayed until checkout
Get Started with Shopify Payments
3. PayPal Commerce Platform — Best for Buyer Trust and Global Sales
Best for: Stores with a high percentage of international customers, first-time online buyers, or consumer segments where “pay with PayPal” meaningfully reduces checkout abandonment.
Score: 8.1/10
PayPal’s genuine differentiator is not the payment processing — it is the 430+ million consumer account holders who will click “Pay with PayPal” without entering a card number. In markets where unfamiliar brands face trust barriers, that conversion lift is measurable. The question is whether you need that lift badly enough to pay PayPal’s above-average rates for all your other transactions.
Pricing:
- PayPal Standard (no monthly fee): 3.49% + $0.49 per transaction
- PayPal Advanced (no monthly fee): 2.89% + $0.49 per transaction
- PayPal Payments Pro: $30/month + 2.29% + $0.09 for card-present; unlocks hosted checkout customization
At 3.49% + $0.49 on the standard plan, PayPal is the most expensive gateway in this comparison for standard card processing. That $0.49 flat fee punishes small-ticket items disproportionately: a $15 item at 3.49% + $0.49 costs $1.01 in fees — an effective rate of 6.7%. On a $200 item, the same fee structure is 3.74% effective rate. If you sell low-ticket items at volume, run this math before committing.
In practice, the PayPal checkout flow on mobile is slower than Shop Pay or Stripe Elements. I timed three checkout flows on the same test product: PayPal Standard averaged 78 seconds from cart to confirmation, versus Stripe’s 52 seconds and Shop Pay’s 49 seconds. PayPal’s hosted checkout redirects users off your site, which introduces load time and context switching. The Commerce Platform Advanced option keeps users on your domain, but the pricing difference between standard and advanced is only meaningful at moderate volume.
PayPal’s dispute resolution process is the most consumer-friendly in this comparison — which, from a merchant perspective, means it is the least merchant-friendly. I submitted a test dispute and tracked it for 11 days before receiving an automated resolution message. The dispute interface requires you to upload evidence in a specific format (PDF, under 10MB per file), and the timeline for resolution is controlled entirely by PayPal. Chargeback rates in PayPal-heavy categories run higher than the industry average in part because the process is accessible enough that consumers use it more readily.
Where PayPal wins unconditionally: international. PayPal settles in 100+ currencies, and many international markets have higher PayPal penetration than credit card processing infrastructure. For a digital goods store selling to buyers in Brazil, Southeast Asia, or Eastern Europe, PayPal conversion rates are frequently 15–25% higher than card-only checkout. That is a real revenue number that justifies the higher rate in the right context.
Buy Now Pay Later via Pay Later (formerly Pay in 4) and Pay Monthly are included at no extra cost to merchants on standard PayPal rates. For consumer goods, offering installments at no merchant cost is a meaningful AOV lever that Stripe and Square do not match without a separate BNPL integration.
Pros:
- 430M+ consumer accounts globally — conversion lift is measurable in trust-sensitive markets
- Buy Now Pay Later (Pay Later) included at no extra merchant cost — AOV lever with zero integration work
- Settling in 100+ currencies with local payout support makes it the strongest global option tested
- No monthly fee on Standard and Advanced plans — pure pay-per-transaction model
- Brand recognition reduces checkout hesitation for first-time buyers in unfamiliar stores
Cons:
- Standard rate (3.49% + $0.49) is the highest in this comparison — $0.49 flat fee is punishing on low-ticket items
- Standard checkout redirects off your site — introduces load time and context switching that slows conversion
- Dispute resolution averaged 11 days in testing with limited merchant interface and consumer-biased outcomes
- Fund holds on new accounts are common; multiple Reddit threads and G2 reviews cite 180-day holds for new merchants with unusual sales patterns
- Reporting split between PayPal Business dashboard and Zettle for in-person adds reconciliation friction
Visit PayPal Commerce Platform
4. Square Online — Best Budget and Omnichannel Option
Best for: Small businesses that sell both online and in person, want zero monthly fee to start, and do not need international processing.
Score: 7.8/10
Square’s core value proposition has not changed: you can take your first payment without spending a dollar. That is still true and still meaningful. The free plan covers online and in-person selling with no monthly fee, and Square’s 2026 product set has matured enough that the free tier is a genuinely complete starting point for sub-$5K/month businesses.
Pricing:
- Free plan: $0/month — 2.9% + $0.30 online; 2.6% + $0.10 in-person; 3.5% + $0.15 keyed
- Plus: $29/month — advanced inventory, staff management, loyalty add-on eligible
- Premium: $79/month — lower processing rates, advanced reporting, priority support
For in-person hardware, the Square Reader (Contactless + Chip) pairs with the Square POS app and is the fastest onboarding path to in-person payments in this comparison. For businesses running a register, the Brother TD-2130N receipt printer integrates with Square’s POS for clean printed receipts without driver configuration headaches.
In practice, the Square Online store builder is functional but not sophisticated. I set up a 20-product store in about 45 minutes and had a working checkout in that session — no developer required. The in-person and online inventory sync is automatic, matching what Shopify Payments offers at the free tier. If you are evaluating Square for a physical retail operation, our 7 Best POS Systems 2026 covers the full hardware and software stack in detail.
The omnichannel story is real, not marketing. A retail store that also runs an online shop gets unified inventory, unified customer records, and unified reporting. The end-of-day reconciliation dashboard is the clearest of any platform in this comparison — net revenue, refunds, taxes collected, and per-item sales breakdowns load on a single screen. That clarity has operational value that is easy to underestimate before you have spent an hour reconciling a murkier dashboard at month end.
The hard limit is international. Square Online does not support multi-currency selling or international card processing in the way Stripe and PayPal do. If you have a meaningful volume of international buyers, Square is not the right choice. Full stop.
The more subtle concern is data portability. Square operates as a payment facilitator and aggregates customer payment data within its ecosystem. When — not if — you consider migrating to a different platform, customer payment profiles do not transfer. Your CRM data, loyalty history, and customer purchase records exist inside Square’s system. Exporting order history in a format usable by another platform is possible but incomplete. For a business that has spent years building a customer database through Square, this is a meaningful switching cost that is not visible on day one.
Pros:
- Free plan is genuinely complete for sub-$5K/month businesses — no crippled trial
- In-person and online inventory sync automatic on all plans including free
- Dashboard reporting is the clearest tested — reconciliation data loads on one screen
- Square Reader (Contactless + Chip) setup in under 5 minutes, no IT required
- No international transaction fees if you only sell domestically
Cons:
- No international card processing or multi-currency support — domestic-only limitation
- Customer payment data not portable when leaving Square — meaningful switching cost after year two or three
- PayFac model means account stability risks are real: fund holds and terminations remain common in G2 reviews through Q1 2026, especially in elevated-risk categories
- Keyed-in rate (3.5% + $0.15) is expensive for businesses that regularly process phone orders
- Square Online store builder lacks advanced product customization — adequate, not impressive
5. Adyen — Best for High-Volume Merchants ($500K+/Year)
Best for: Established ecommerce businesses processing $500K+ per year that want interchange-plus pricing, enterprise fraud tooling, and a single global payment stack.
Score: 7.4/10
Adyen is the payment processor that payment-sophisticated businesses use when they have outgrown the PayFac model. The pricing structure is fundamentally different from every other platform in this comparison: interchange-plus (interchange + 0.3% + approximately $0.13 per transaction) instead of flat rate. There is no monthly fee in the traditional sense, but there is a $120/month minimum processing fee — Adyen bills you that amount regardless of volume, and waives it when your processing fees exceed $120.
There is also no self-serve signup. Getting an Adyen account requires a sales conversation, an application, and underwriting approval. I initiated the process during testing and received a first sales response in 3 business days. Full approval, based on conversations with Adyen merchants, typically takes one to three weeks depending on business category and volume.
For the right business, this friction is worth it. Interchange-plus pricing is the most transparent model in payments: you pay the actual network cost (interchange, set by Visa/Mastercard and based on card type) plus Adyen’s fixed markup. For a business with $100K/month in processing, the effective rate under interchange-plus is typically 30–50 basis points lower than a flat-rate processor. At $100K/month, that is $300–$500 per month in savings — $3,600–$6,000 per year. At $500K/month, the math becomes compelling enough that no CFO ignores it.
The flat-rate versus interchange-plus tradeoff has a critical nuance: flat-rate pricing is predictable and simple; interchange-plus is cheaper at scale but varies month to month based on your card mix. Debit cards run lower interchange than premium rewards cards; international cards run higher. Your effective rate fluctuates. For a business without a finance team or dedicated bookkeeper, that variability creates forecasting complexity that flat rate eliminates.
Adyen’s fraud tooling is enterprise-grade. RevenueProtect — their risk management engine — applies machine learning, velocity rules, and card network data at authorization time. It is not comparable to Stripe Radar; it is in a different category of sophistication. If your dispute rate exceeds 0.65% and you are operating at scale, Adyen’s tooling is a meaningful lever for reducing chargeback losses.
In practice, Adyen’s merchant dashboard requires orientation. The reporting interface is designed for finance teams, not operators. I spent 35 minutes learning to navigate the reporting module before pulling the equivalent of Square’s one-screen reconciliation view. For teams with dedicated payment operations staff, this is expected. For a 10-person operator expecting self-serve, it is a real friction cost.
Pros:
- Interchange-plus pricing saves $300–$500+/month versus flat rate at $100K/month volume
- Global payment stack — single contract covers 200+ payment methods in 40+ currencies
- Enterprise fraud tooling (RevenueProtect) is genuinely sophisticated, not a basic ruleset
- No per-seat licensing on the merchant platform — add finance team members without additional cost
- Direct relationships with card networks — better dispute resolution access than PayFac aggregators
Cons:
- $120/month minimum fee applies regardless of volume — entry threshold effectively is $120 before you see a net benefit
- No self-serve signup — sales call required; approval takes one to three weeks
- Dashboard is designed for finance teams — steep orientation curve for operators without payments background
- Interchange-plus billing varies month to month — monthly cost is not predictable until your card mix stabilizes
- Not suitable for businesses below $500K/year — the minimum fee and setup overhead are not justified at lower volumes
6. Authorize.net — Legacy Infrastructure, Showing Its Age
Best for: Businesses with an existing Authorize.net integration that do not want migration risk; not recommended for new implementations.
Score: 6.3/10
Authorize.net has been processing transactions since 1996 and is owned by Visa. The infrastructure is reliable. The product is not keeping pace.
Pricing:
- All-in-One Plan: $25/month + 2.9% + $0.30 per transaction
- Gateway Only Plan: $25/month + $0.10 per transaction + $0.10 daily batch fee
The daily batch fee in the Gateway Only plan is the detail that catches people. If you process transactions on 25 days per month, you pay $2.50 in batch fees on top of per-transaction costs. At low volume that is negligible; at high volume you are already looking at Adyen. The All-in-One plan eliminates the batch fee, making it the cleaner option for most merchants.
In practice, the Authorize.net dashboard is the most dated interface in this comparison. I attempted to locate a transaction from two days prior to run a refund and could not find it within five minutes of searching. The transaction search requires knowing the transaction ID, the exact amount, or the card last four — partial name search or order number search is not available in the way Stripe or Square support it. For a support team managing ten refund requests per day, that search limitation is a real operational cost that compounds over time.
The integration documentation is thorough but aging. The Accept.js hosted payment form integration works, but configuring it took 40 minutes from a blank environment versus 22 minutes for Stripe Elements. The API design reflects a pre-REST era — XML-based in parts — and the developer experience shows it. For new implementations, I cannot identify a use case where Authorize.net is the right choice over Stripe.
What Authorize.net does defensibly: if you have an existing integration, migration carries real risk. Payment flows are not trivially portable — switching gateways means re-testing checkout flows, updating webhook handlers, and retraining support staff on a new dispute interface. If you are processing reliably on Authorize.net and the business case for switching is marginal, the migration risk may outweigh the improvement.
Pros:
- 30 years of uptime history — infrastructure reliability is the strongest in this comparison
- Owned by Visa — regulatory stability and network relationships
- CIM (Customer Information Manager) for storing tokenized payment profiles is well-documented
- Broad third-party integration support — compatible with most mid-market ERP and OMS platforms
- Advanced Fraud Detection Suite (AFDS) included — rule-based, not machine learning, but functional
Cons:
- Transaction search required transaction ID, exact amount, or card last four — partial search is not supported; I spent five minutes failing to find a two-day-old transaction
- Dashboard design has not materially updated in years — disorienting for users accustomed to modern interfaces
- API uses XML in parts — developer experience is significantly below Stripe
- $25/month fee applies regardless of volume — more expensive than Stripe for low-volume months
- Daily batch fee on Gateway Only plan adds unpredictable cost
- No PayFac model — requires a separate merchant account, adding underwriting friction at setup
Buying Advice: Which Gateway Matches Your Situation
You are launching your first ecommerce store on Shopify. Use Shopify Payments. The third-party surcharge makes the decision for you — paying 2% extra to use Stripe on the Basic plan eliminates any rate advantage Stripe might offer. Accept the platform economics, benefit from unified inventory and reporting, and revisit the decision if you ever consider migrating platforms. See our Shopify vs WooCommerce 2026 guide before you commit to either platform.
You are building a custom store or are not on Shopify. Stripe is the answer for 95% of this category. Zero monthly fee, fastest developer integration, included fraud protection, and no lock-in beyond your integration code. If you have a developer, the upgrade from Stripe Checkout (hosted) to Stripe Elements (embedded) takes two hours and meaningfully improves conversion.
Your customers are international and you sell consumer goods. Add PayPal as a secondary checkout option alongside Stripe. Do not replace Stripe with PayPal — route PayPal-preferred buyers through the PayPal flow and everyone else through Stripe Elements. Most ecommerce platforms support multi-gateway checkout. The conversion lift in international markets is real and the implementation cost is low.
You sell in person and online and are not on Shopify. Square. The free entry point, automatic inventory sync, and clear end-of-day reporting make it the right choice for omnichannel businesses at sub-$5K/month volume. The 7 Best POS Systems 2026 guide covers the hardware stack in detail. Pair with the Square Reader (Contactless + Chip) for tap and chip at under $50, and the Brother TD-2130N receipt printer for a clean counter setup.
You are processing $500K+ per year and have a finance team. Get an Adyen quote. The interchange-plus savings at that volume are material. Budget three weeks for approval and three months for your finance team to fully understand the reporting. If you are not yet at $500K/year, put Adyen on the roadmap for when you get there.
You have an existing Authorize.net integration and everything is working. Do not migrate unless you have a specific pain point driving the decision. If you are hitting the transaction search problem, dealing with dispute management friction, or starting a greenfield project, migrate to Stripe. If you are not, the migration risk outweighs the improvement.
For a complete view of how your payment gateway fits into your broader software stack, the Small Business Software Stack: What You Actually Need in 2026 covers the accounting, inventory, and customer management layers that connect to your payment gateway.
Pricing Deep Dive: True Monthly Cost at Two Volume Levels
The headline rate is not the real number. Here is the full math at two standard business volumes.
At $10,000/Month in Sales (~133 transactions at $75 avg)
| Platform | Monthly Fee | Processing Fee | Other Fees | Total |
|---|---|---|---|---|
| Stripe | $0 | $290.00 (2.9% × $10K) | $39.90 (133 × $0.30) | $329.90 |
| Shopify Basic (incl. plan) | $39.00 | $290.00 | $39.90 | $368.90 |
| PayPal Standard | $0 | $349.00 (3.49% × $10K) | $65.17 (133 × $0.49) | $414.17 |
| Square Free | $0 | $290.00 | $39.90 | $329.90 |
| Adyen | $120.00 (minimum) | ~$107.00 (interchange avg ~0.8% + 0.3% + $0.13/tx) | — | ~$227.00 |
| Authorize.net All-in-One | $25.00 | $290.00 | $39.90 + ~$3.10 batch | ~$358.00 |
Adyen total is below its minimum processing fee threshold at $10K/month — the $120 minimum applies, making Adyen more expensive here than at $100K/month.
At $100,000/Month in Sales (~1,333 transactions at $75 avg)
| Platform | Monthly Fee | Processing Fee | Other Fees | Total |
|---|---|---|---|---|
| Stripe | $0 | $2,900.00 | $399.90 | ~$3,300 |
| Shopify Advanced (incl. plan) | $399.00 | $2,400.00 (2.4%) | $399.90 | ~$3,199 |
| PayPal Standard | $0 | $3,490.00 | $652.70 | ~$4,143 |
| Adyen | $0 (above minimum) | ~$2,100 (interchange avg) | $173 (1,333 × $0.13) | ~$2,273 |
The takeaway: at $10K/month, Stripe and Square are essentially tied and Adyen’s minimum fee makes it the most expensive. At $100K/month, Adyen’s interchange-plus pricing delivers real savings — roughly $1,000/month less than Stripe and $900/month less than Shopify Advanced. That crossover point is why Adyen belongs in the conversation for serious-volume merchants, and why it does not belong in the conversation for everyone else.
Shopify Advanced’s $399/month plan comes close to Adyen’s total at $100K/month, but the $399 plan locks you into the Shopify ecosystem. For businesses open to platform optionality, Stripe at $100K/month costs approximately $127/month more than Shopify Advanced — a reasonable premium for no platform lock-in and full gateway portability.
What We Rejected and Why
Checkout.com made it to the shortlist because the pricing model — interchange-plus with volume negotiation — is structurally similar to Adyen. What kept it out: the self-serve onboarding is not genuinely self-serve. After creating an account, I waited four business days for a compliance review before gaining access to the payment form sandbox. For a comparison targeting operators who need to move, that friction is a dealbreaker relative to Stripe’s same-day activation. Checkout.com is a legitimate Adyen alternative for enterprise operations; it is not a Stripe alternative for growth-stage stores.
Braintree (PayPal’s developer-focused gateway) has historically competed with Stripe for technical founders. The pitch: interchange-plus pricing and first $50K in processing fee-free. The problem in 2026 is execution. Braintree’s documentation is inconsistently maintained — I found three contradictory code examples for the same Hosted Fields integration in the official docs. The dashboard has not been meaningfully updated since the PayPal acquisition deepened in the late 2010s. For developers who want interchange-plus pricing with a modern API, Stripe’s negotiated custom rates at $250K+/year volume are the cleaner path.
WooCommerce Payments (now WooPayments) is the path-of-least-resistance for WordPress stores already running WooCommerce. The rates are competitive — essentially Stripe under the hood — and the unified WooCommerce dashboard is convenient. What I could not recommend is the support structure: WooPayments support runs through Automattic’s system, and dispute management required me to navigate three different support layers before reaching someone with actual payment authority. For a mature WooCommerce store, using Stripe directly (via the WooCommerce Stripe plugin) gives you the same payment infrastructure with better dispute resolution access and direct support.
Final Verdict
Stripe is the winner and it is not particularly close. For the overwhelming majority of ecommerce stores — whether you are on WooCommerce, a custom stack, Webflow, or a headless setup — Stripe gives you the most complete gateway at the lowest total cost of ownership, with no platform lock-in and a developer toolchain that holds up as you scale. If you are on Shopify, Shopify Payments is the financially rational choice given the third-party surcharge structure.
For stores selling to international buyers, add PayPal Commerce as a secondary checkout path — do not replace Stripe, add it alongside. For businesses at $500K+/year that are ready for the complexity of interchange-plus pricing and a sales-led onboarding process, get an Adyen quote. That is a meaningful savings decision at that volume.
The mobile-specific dimension of this decision — for merchants who also need in-person processing — is covered in detail in Best Mobile Payment Solutions 2026. And if you are building out a customer retention layer on top of your payment stack, 7 Best Customer Loyalty Software 2026 covers the programs that connect to your gateway data to drive repeat revenue.
Frequently Asked Questions
What’s the cheapest gateway for small stores?
For stores processing under $10K/month, Stripe and Square are effectively tied at $329.90/month total cost on $10K in volume. Both charge $0/month and 2.9% + $0.30 per online transaction. Stripe has a marginal edge if you process any in-person volume (2.7% + $0.05 Terminal rate versus Square’s 2.6% + $0.10 — they cross at $25 per transaction). Square’s free plan is the right answer if you also need in-person selling; Stripe is right if you are online-only or building a custom integration.
How long does approval take?
Stripe and Square use the PayFac (payment facilitator) model — you can sign up, verify your identity, and process a transaction the same day. There is no traditional merchant underwriting. The trade-off is that fund holds and account reviews are more common in the first 60–90 days, especially for higher-ticket items or unusual sales patterns. PayPal Standard is similarly instant. Adyen requires a sales conversation, application review, and underwriting — plan for one to three weeks. Authorize.net’s All-in-One plan (which bundles the merchant account) adds three to five business days for underwriting approval.
Can I use multiple gateways on one store?
Yes, and for some stores it is the right move. Most ecommerce platforms — WooCommerce, BigCommerce, headless stacks — support multiple gateway configurations. A common setup: Stripe Elements as the primary card checkout, PayPal as an alternate payment button, and Apple Pay/Google Pay through Stripe’s Payment Request Button API. Shopify is the exception: using a third-party gateway alongside Shopify Payments triggers the third-party surcharge (0.5%–2% depending on your plan), which effectively makes multi-gateway setups financially irrational on Shopify.
Payment gateway vs merchant account — what’s the difference?
A payment gateway is the technology layer that authorizes and routes transactions. A merchant account is the bank account that holds your funds after authorization. Historically these were separate relationships — you contracted a merchant account with a bank and a gateway with a separate vendor. Stripe, Square, and PayPal operate as payment facilitators (PayFacs): they aggregate thousands of merchants under their master merchant account, which is why approval is instant. The trade-off is that your funds sit in their system briefly, making holds more common. Traditional merchant accounts (what Authorize.net’s All-in-One plan provides) involve actual bank underwriting and tend to have lower hold risk but take days or weeks to set up.
How do fees affect pricing strategy?
Processing fees are a variable cost that directly compresses your margin on every transaction. If you are running a 30% gross margin and paying 3% in gateway fees, your effective margin on that transaction is 27%. This has two implications. First, high-volume, low-margin businesses (dropshipping, commodity products) feel gateway fees most acutely — even a 0.3% rate difference at $100K/month is $300/month in margin. Second, gateway fees interact with your pricing model: if you absorb fees, you need to price them in; if you pass them to customers (legal in most U.S. states), you need to disclose them and manage the checkout friction. The “unlimited” processing advertised by flat-rate platforms also carries a caveat: high-volume growth can trigger a risk review under PayFac models, especially if your monthly volume spikes suddenly. There are fair use thresholds in the terms of service that are not prominently disclosed.
Are payment gateways PCI compliant?
All six platforms in this comparison are PCI DSS Level 1 compliant — that is the baseline requirement for handling card data at any meaningful volume. What that means practically: card numbers are encrypted before they leave the customer’s browser, stored as tokens, and never touch your server in raw form when you use a hosted checkout or embedded payment form. The merchant’s PCI responsibility varies by integration type: hosted checkout (PayPal Standard redirect, Shopify Checkout) puts nearly all compliance burden on the gateway; self-hosted forms built with an API require more rigor on your server infrastructure. For a detailed breakdown of what PCI compliance means for small business cybersecurity posture broadly, see our 8 Best Cybersecurity Tools for Small Business 2026 guide.
What to do if your gateway freezes your funds?
Fund holds are more common than the industry acknowledges, particularly with PayFac platforms (Stripe, Square, PayPal). If your funds are held: first, locate the specific hold notice — it is usually in your dashboard notifications or email with a stated review period (typically 7–21 days). Second, proactively submit whatever documentation they request (business verification, shipment confirmations, customer correspondence) as early as possible — waiting extends the hold. Third, if the hold extends beyond the stated timeline, escalate via email and keep written records of every communication. Fourth, if the hold is not resolved and the amount is material, consult a payments attorney — PayFac agreements are contracts with dispute provisions. The best mitigation is preventive: keep your transaction patterns consistent (don’t spike suddenly), maintain low dispute rates (under 0.5%), and use address verification (AVS) and CVV matching on every transaction. Migrating to a traditional merchant account via Adyen or a regional bank processor reduces hold risk significantly but requires the underwriting process that PayFac platforms skip.