The right payment platform is the one that fits your registered country, customer markets, transaction mix, operating model and technical capacity—not the one with the most prominent advertised rate. Compare total cost, merchant eligibility, buyer payment coverage, integration work, settlement and currencies, risk controls, reporting and any in-person hardware before you choose.
Provider terms change by country, payment method and product. The documentation cited here was checked on October 13, 2026; confirm current eligibility, pricing and feature availability with each provider before opening an account or committing engineering time.
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Start with the business you actually operate
A useful comparison begins with your facts, not a provider shortlist. Write down the details below before opening pricing pages. They determine which offers are available and whether a seemingly inexpensive processor will work once your real payment mix is applied.
Registration and selling countries
Record the country where the legal business is registered and where its bank account is held. Then list the countries in which customers pay you. These are separate questions: a provider may onboard a business in one set of countries while supporting buyers, acquiring regions or settlement currencies in another. Adyen publishes platform onboarding countries and acquiring regions in its Platforms documentation. Square says its seller must be in the country where the Square account was activated and that card acceptance is available only in specified countries; its current guidance is at Square’s accepted-cards page. Stripe maintains a country-specific availability reference at its feature-availability page.
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- Use the, easy-to-use, and customizable POS to get started.
Do not infer eligibility from a provider’s global marketing language. Ask whether your exact legal entity, business category, website, bank country and customer geographies can use the product you intend to buy.
Operating model
Classify the business as an online shop, subscription service, marketplace, software platform, service business, or a combination with face-to-face sales. A single-merchant shop generally needs checkout, payment acceptance, refunds and reconciliation. A marketplace may additionally need seller onboarding, identity verification, split payments and separate payouts. A hybrid retailer needs card-not-present checkout plus card-present devices.
Adyen for Platforms documents seller onboarding and verification, payment processing, split payments, managed or custom payouts, risk management and reconciliation. Those capabilities are relevant when money must be routed among multiple sellers; they may be unnecessary complexity for a shop that sells only its own inventory.
Transaction profile
Use at least one representative month, or a defensible forecast, to record:
- Average and median order value, plus the range of unusually small and large orders.
- Expected monthly transaction count and total value.
- Domestic versus international card share.
- Payment methods customers actually use or are likely to request.
- Refund frequency, partial refunds and expected disputes.
- Subscription renewals or other recurring charges.
- Sales that occur in person, if any.
A provider’s headline rate cannot answer your cost question without these variables. A high share of international or alternative payment methods can produce a different result from a domestic card-only shop, even when the advertised starting rate looks similar.
Model total cost instead of comparing one rate
Build a line-by-line model for each candidate. Adyen describes its pricing as a fixed processing fee plus a fee determined by the payment method, and says its posted fees are indicative; minimum invoices and eligibility can depend on the business model. Square notes that international transaction fees may be added for cards issued outside the seller’s home country in covered markets. Treat both statements as reasons to model your own mix, not as universal prices. See Adyen pricing and Square API pricing for the providers’ current terms.
Inputs to put in the spreadsheet
| Input | How to use it |
|---|---|
| Payment method | Separate cards, wallets and each locally preferred method because the method-specific charge can differ. |
| Transaction value and count | Apply each provider’s fixed and variable charges to your actual order-size distribution, not only to an average. |
| Customer and card geography | Mark domestic and international transactions separately; international cards can trigger additional charges in covered markets. |
| Refunds | Model the cost and cash-flow effect of your expected full and partial refunds under the provider’s current terms. |
| Disputes | Include the financial and operational cost of your expected dispute volume and the work required to answer cases. |
| Other account charges | Check for minimum invoices, plan charges, currency conversion or other fees that apply to your business model. |
Calculate a comparable effective cost
For each provider, calculate total charges for the same period and divide by the period’s processed value. Keep a second result divided by the number of orders so you can see how fixed per-transaction charges affect low-value sales. Run separate scenarios for domestic-heavy, international-heavy and alternative-method-heavy mixes. Do not blend them into one percentage that hides the reason for a difference.
Record whether a quoted amount is a live, country-specific term, an indicative price, a one-time allowance or a recurring charge. Save the date and the exact page used. Rates and eligibility can change, so a spreadsheet should contain a review date rather than pretending the result is permanent.
Read pricing language precisely
Adyen’s pricing FAQ describes Interchange++ as “a pricing model which accurately tracks Interchange rates and scheme fees right down to a transaction level.” This is an official Adyen description, not an independent performance assessment. Ask each provider whether the price you receive is fixed, method-dependent, interchange-linked, tiered or subject to minimums, and request the definition of every fee in the written offer.
Verify merchant eligibility and buyer payment coverage
There are two coverage tests. Merchant availability asks whether your business can open and operate the account. Buyer coverage asks whether customers can pay with the cards and methods they use in each market. Passing one does not guarantee the other.
Rank #2
- Get your money as soon as the next business day.
- Get set up quickly with no long-term commitments. Download the Square Point of Sale app for free, create an account, and start taking payments anywhere.
- Run your business all in one place with the free Square Point of Sale app. Track your sales, manage inventory, accept tips, send receipts digitally, and more.
- Works with Apple devices with a Lightning connector.
Merchant-side checks
- Confirm that your registration country appears in the provider’s onboarding or supported-country documentation.
- Check whether your business category requires additional review or has product restrictions.
- Verify that the bank account and settlement currency you need are supported.
- Ask whether the exact product—online checkout, platform account or in-person acceptance—is available in that country, rather than assuming every product shares the same footprint.
- Obtain written confirmation for unusual ownership, marketplace or cross-border arrangements before development begins.
Buyer-side checks
List the cards, wallets and locally preferred methods used by customers in each target market. Confirm the methods are available in your checkout product, not merely elsewhere in the provider’s portfolio. Test the customer experience in the currencies and languages you plan to show, and check what happens when a customer uses an internationally issued card.
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Match checkout and integration effort to your team
Compare the work required to accept a payment, handle a failed attempt, issue a refund, receive a webhook or equivalent notification, and reconcile the result with an order. A low processing cost can be a poor choice if implementation delays launch or creates fragile payment logic.
Choose an integration pattern
- Hosted or provider-managed checkout: usually reduces the payment data your application touches and can shorten the first implementation. Confirm how much branding, localization and method control you retain.
- Client-side components: let your site collect payment details through provider-supplied elements. Adyen documents PCI-compliant client-side methods for collecting and encrypting card information.
- Direct API integration: gives the engineering team more control over order state, retries and a custom experience, but requires careful handling of webhooks, idempotency, refunds and error states.
- Plugin or commerce connector: can reduce custom code when your store platform is supported. Verify that the connector covers subscriptions, refunds, tax display and reconciliation needs rather than only the initial charge.
Plan PCI and authentication responsibilities
Adyen states that PCI DSS documentation can be required depending on the integration. Determine which parts of the card-data flow are handled by the provider and which remain your responsibility. Document who owns secure key storage, access control, logging, vulnerability management and incident response.
Adyen also provides a 3D Secure integration path. Treat 3D Secure as an implementation requirement to design and test, not proof that one provider is categorically more secure than another. Map the customer journeys for a frictionless authentication, a challenge, a failed challenge and a customer who cannot complete authentication.
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Test operational edge cases
A test plan should include duplicate-click prevention, abandoned checkout, declined cards, expired cards, partial refunds, full refunds, disputed payments, delayed notifications and a payment that succeeds at the bank but times out in your browser. Reconcile every test with the order record and the provider’s transaction record before going live.
Compare payouts, currencies and reconciliation
Settlement determines when cash reaches the bank account and how much accounting work follows. Ask for the payout schedule, supported settlement currencies, minimums, reserve or hold conditions, and the data fields available for matching a payment to an order.
Separate customer charge currency from settlement currency
A customer may pay in one currency while you settle in another. Model the conversion point, the rate source and any conversion charge. Adyen’s pricing FAQ explicitly addresses the question “Do you support multi-currency transactions?” and says Adyen can link multiple bank accounts in multiple currencies to avoid conversion. That is a provider-specific arrangement; do not assume another provider settles in the same way.
Design the reconciliation workflow
- Define a unique order or payment identifier that appears in your store and provider records.
- Capture authorization, capture, refund, dispute and payout events separately.
- Match gross transaction value, fees, refunds and net payout to the bank statement.
- Set a process for unmatched items and late or corrected events.
- Decide how finance staff will export, retain and review reports.
For a marketplace, add seller-level allocation, split-payment records and payout reconciliation. Adyen’s platform documentation identifies reconciliation and split payments as platform functions; confirm the exact reports and API objects available for your account.
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Evaluate fraud, authentication and disputes as operating work
Payment acceptance is not only a successful authorization. Compare the controls available to identify suspicious activity, request authentication when appropriate, block or review a transaction, and assemble evidence for a dispute. Ask which controls are included, which require configuration, and which decisions remain yours.
Rank #3
- Pay one transparent rate per swipe for Visa, Mastercard, Discover and American Express.
- Works in conjunction with most downloadable Square point-of-sale apps on your device. Customers can pay, tip and sign directly on your device. Track payments in cash, gift cards and more. Also lets you send receipts via e-mail or text message, makes it easy to apply discounts, keeps a data and sales history log and more.
- Accepts magstripe credit card payments, including those from Visa, Mastercard, Discover and American Express (fees apply).
- App sends deposits to your bank account within 1 to 2 business days, or enjoy instant deposits (fees apply).
Adyen for Platforms describes risk management, while its card documentation describes a 3D Secure path. These references establish that the tools exist in those products; they do not establish a universal fraud rate or guarantee that a particular configuration will prevent losses.
Write a responsibility matrix
| Activity | Decision to document |
|---|---|
| Risk rules | Who creates, tests and changes allow, block and review rules? |
| Authentication | Who handles 3D Secure setup, challenge failures and customer support? |
| Disputes | Who receives notices, gathers evidence and tracks deadlines? |
| Refunds | Who can approve a refund and how is it recorded in accounting? |
| Monitoring | Which reports reveal spikes in declines, refunds or disputes? |
Use platform features only when your model needs them
A marketplace or software platform should compare more than checkout. Confirm whether the provider supports seller application, verification, payment collection on behalf of sellers, split allocation, managed or custom payouts, risk controls and reconciliation. Adyen documents all of these areas for Adyen for Platforms at docs.adyen.com/platforms.
Map the money flow before selecting a product: who is the merchant of record, who receives funds first, how commissions are represented, what happens when an order is refunded, and how a seller is paid after a dispute. If you cannot draw that flow unambiguously, a basic single-merchant integration may be the wrong starting point—or you may be evaluating a platform product you do not need.
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Online-only businesses do not need a card reader or terminal merely because a provider sells one. A hybrid business may need card-present equipment for events, appointments, pickup counters or stores. Square identifies Square Readers and Square Terminal as hardware for in-person payments and provides APIs and SDKs for connecting devices to custom applications; its API pricing documentation is at developer.squareup.com/docs/payments-pricing.
Before buying hardware, confirm the country, model and software compatibility, how devices are replaced, and whether online and in-person transactions appear in a unified report. Test a real card-present flow, a refund and a network interruption. Treat a reader as an optional operating component, not a reason to choose a provider for an online-only checkout.
Build a weighted scorecard
After collecting written answers, score each candidate against the priorities of your business. Weight the categories before looking at the scores so a familiar brand or attractive headline fee does not dominate the decision.
| Decision category | Questions to answer | Evidence to retain |
|---|---|---|
| Total cost | What is the effective cost for each payment mix, ticket size and geography? | Country-specific pricing, fee definitions and your dated model. |
| Eligibility | Can this legal entity use the needed product in its registration country? | Supported-country documentation and written account confirmation. |
| Buyer coverage | Can customers use their preferred cards and methods in each target market? | Method availability by country and checkout test results. |
| Integration | Can the team implement checkout, notifications, refunds and reconciliation safely? | API or plugin documentation, estimates and test outcomes. |
| Settlement | When and in which currencies will funds arrive, and how will finance match them? | Payout terms, currency support and sample reports. |
| Risk and compliance | Which PCI, authentication, fraud and dispute tasks remain with the business? | Responsibility matrix and security review. |
| Platform capability | Are seller verification, split payments and payouts required? | Platform product documentation and money-flow diagram. |
| In-person operations | Are compatible readers, terminals and device APIs needed? | Country/model compatibility and an in-person test plan. |
Use a pass/fail gate for non-negotiables such as legal eligibility, required payment methods and settlement currency. Only score candidates that pass those gates. A weighted score is a decision aid, not a substitute for contractual terms.
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- Create a test account or sandbox: implement the smallest complete flow, including success, decline, refund and notification handling.
- Test representative geography: use the countries, currencies and payment methods that matter to your customers, not only a domestic test card.
- Reconcile end to end: match orders, provider records, fees, refunds and the resulting payout.
- Exercise support procedures: have staff handle a failed authentication, duplicate order, refund request and dispute notification.
- Review production terms: confirm the live account’s pricing, minimums, payout schedule, reserves and eligibility before moving traffic.
- Start with controlled volume: monitor approval, refund, dispute, payout and reconciliation results, then expand only after the operating team can explain every exception.
Common comparison mistakes and how to correct them
Choosing the lowest advertised percentage
Why it fails: a single rate ignores payment-method charges, fixed fees, international cards, refunds, disputes and minimum invoices.
Correction: calculate total and per-order cost for your actual mix, then preserve the assumptions and date.
Assuming a global provider serves every seller
Why it fails: onboarding countries, acquiring regions and product eligibility differ.
Rank #4
- With Square Terminal, you can ring up sales, accept payments, and print receipts, all with one device. Use it at the counter or ring up customers anywhere in your store.
- Accept all major credit and debit cards and pay one low rate with no hidden fees and no long-term contracts.
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- Get your money as soon as the next business day.
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Correction: verify the legal entity and product in official country documentation and obtain account-specific confirmation.
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Confusing card acceptance with method coverage
Why it fails: a provider may accept cards in a market while not offering the wallet or local method your customers expect.
Correction: create a country-by-country method list and test it in the intended checkout.
Underestimating integration and compliance
Why it fails: payment data handling, PCI documentation, authentication and webhook failures become engineering and security work.
Correction: select an integration pattern, assign responsibilities and test failure paths before launch.
Buying hardware for an online-only business
Why it fails: a card-present reader does not improve a checkout that never accepts in-person cards.
Correction: purchase devices only when a real sales channel needs them and compatibility is confirmed.
Apply the method to common business situations
Domestic online shop
Prioritize local eligibility, the cards and methods your buyers use, checkout reliability, refunds and straightforward reconciliation. A platform product designed for multi-seller payouts may add work without solving a requirement.
Cross-border seller
Put country availability, international-card charges, customer currencies, settlement accounts and conversion treatment at the top of the scorecard. Run separate cost scenarios for each major market rather than using one blended average.
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Start with the funds-flow diagram and seller lifecycle. Verify onboarding, verification, split allocation, managed or custom payouts, risk controls and reconciliation before comparing front-end checkout details.
Online business adding events or a store
Keep online and card-present requirements in one operating map. Check reader or terminal availability in your country, device compatibility, API or SDK support and whether reports can reconcile both channels.
Final decision checklist
- Registration country, bank country and customer markets are documented.
- Required product eligibility is confirmed for the legal entity.
- Cards, wallets and local methods are mapped by market.
- Total cost is modeled by method, ticket size, geography, refunds and disputes.
- Integration, PCI and authentication responsibilities are assigned.
- Payout timing, settlement currencies and reconciliation outputs are understood.
- Marketplace functions are tested if sellers or split funds are involved.
- In-person hardware is included only when a real channel requires it.
- Current terms are rechecked immediately before signing and launch.
No single provider is established as the best choice for every online business. A defensible choice is the one that passes your eligibility and capability gates, remains economical for your measured payment mix, and leaves your team able to operate, reconcile and support every payment after launch.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
