Build and deploy · Practical notes

What should you verify before integrating website payments?

First check provider requirements for your entity, market, and business.

Updated 2026-10-19

On this page

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Direct answer

First check provider requirements for your entity, market, and business. Then test checkout, trusted callbacks, entitlement, and refunds. A success-page visit is not proof of payment, and browser-supplied amounts or status cannot grant access.

When to use

You are adding payment to a real product or evaluating a payment starter.

Step by step

Check eligibility and promises

Review current provider rules for your business, fees, refunds, and settlement. Describe delivery accurately; changing wording must not conceal the actual business. Obtain appropriate advice for entity and tax questions.

Keep authoritative state server-side

Create prices or sessions on the server, verify webhook signatures, and update entitlements idempotently by event and order identifiers. Handle delayed payment, cancellation, and refunds separately from browser redirects.

Test the lifecycle

Use test mode for failures, duplicate callbacks, out-of-order events, and reloads, checking orders against entitlements. Prepare support, alerts, and recovery; passing tests does not establish live approval.

Worked example

Hypothetical exercise, not a real performance claim.

A payment completes but its callback is delayed. Show a recoverable pending state, grant entitlement on a trusted server event, and prevent duplicate events from granting it twice.

Action checklist

Check eligibility and promises
Keep authoritative state server-side
Test the lifecycle

Reusable templates

Payment acceptance record

Business, entity, market, rules, review date:
Product and refund promise:
Server-created session and price:
Signature verification / idempotency / entitlement:
Success, failure, cancellation, delay, duplication, refund:
Support, alerts, and live approval:

Provider review prompt

Compare [official provider rules] with [actual business, delivery, and user content]. Separate explicit requirements, possible conflicts, and unknowns. Suggest no concealment, fabricated information, or approval bypasses. List questions requiring provider confirmation.

Pitfalls

Keep keys server-side and separate test from live configuration. Avoid unnecessary card data and do not treat another project’s approval as your own.

Official references

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