A payment API integration needs a clear contract between business, engineering and operations. A request returning successfully is only one piece of that contract. Your team also needs to know which payment flow is approved, which result is authoritative and what to do when a transaction remains unresolved.
Use this checklist before implementation and again before requesting production use. It is a planning guide, not an API specification. Obtain the documentation that applies to your merchant account before writing payment or signature-handling code.
1. Write the scope in business terms
Record the market, currency, collection method or payout destination, and system being connected. Separate pay-ins from pay-outs even when the provider offers both.
For CVPay, the supported currencies are VND, PHP and USDT, covered by one merchant account and one API. The local fiat markets are Vietnam and the Philippines. Published collection methods must still be confirmed for the individual account. A wallet listed for collections must not be assumed to be a payout destination.
Give the scope document an owner. When a requirement changes, update it before asking engineers to build a different flow.
2. Complete the onboarding and environment discussion
CVPay onboarding requires KYB review. A sandbox is opened before production, and the environments are separate.
Ask which documents and access arrangements apply to your account. Confirm which integration instructions belong to the sandbox and which belong to production. Do not assume that every scenario or feature is simulated in a test environment.
Before testing, record the scope the sandbox can demonstrate and any limitations explained by the integration team. Keep environment access and credentials under the control of the people responsible for the integration.
3. Confirm the API contract before coding
Request the current documentation for the flow you will use. Your engineering review should resolve the following questions:
- How is a request authenticated, and where should credentials be held?
- What are the required fields and the applicable amount and currency representation?
- How are your business records related to the provider's transaction records?
- Which response means a request was received, and which evidence establishes the payment outcome?
- How should the application investigate an unresolved transaction?
Do not infer an answer from a marketing example or another provider's API. Record unresolved questions as blockers for the affected part of the implementation.
4. Define payment states and business actions
Make a small table linking each documented payment state to an action in your system. Specify when an order stays pending, when fulfilment can proceed and when staff should investigate.
Keep the meaning of a request response distinct from a payment result. Also clarify the difference between a reported payment result and money reaching a destination account. Your operations team needs these definitions as much as your developers do.
Assign an owner for deciding whether an order can be released when the available information is incomplete. Avoid letting different teams make that decision from different screens.
5. Review signed status notifications
CVPay provides signed webhooks when payment status changes. Obtain the applicable verification instructions rather than choosing a signing algorithm from an unrelated example.
Ask the technical team to document how your application will verify a notification, associate it with the correct business record and decide what action to take. Discuss how it should respond to an unverified notification, a repeated notification or an unexpected state transition.
Those are integration review questions, not claims about CVPay's retry schedule, event ordering or duplicate protection. The answers must come from the applicable specification and agreed tests.
6. Keep a test record that another person can review
For each agreed scenario, record the starting conditions, expected result, observed result, evidence and responsible reviewer. Include the customer-facing screen and the internal order state where they are relevant.
Ask which unsuccessful or unresolved scenarios can be demonstrated. Where a scenario cannot be simulated, record the agreed operational procedure instead of marking it tested. Do not describe a sandbox test as proof of a production settlement time or a guarantee of future availability.
Have someone outside the implementation pair read the record. They should be able to tell what passed and what remains open without rerunning the whole integration.
7. Prepare the operations handover
Agree what staff should collect when a customer reports a payment issue and how to contact the provider. Identify the business record needed for investigation, while avoiding unnecessary disclosure of credentials or customer information.
Confirm the applicable commercial conditions separately. Fees, limits, enabled methods and any timing requirements should be resolved for the account rather than inferred from a general description of a payment network.
Before requesting production use, review the approved scope, remaining technical questions, test evidence and responsibilities. Any unresolved issue that affects a money movement or fulfilment decision needs an explicit owner and resolution.
8. Measure the right outcomes after launch
Keep checkout activity, payment attempts, payment outcomes and business fulfilment separate in your reporting. An API request is not a completed payment. A completed payment is not automatically a new customer or proof that a marketing channel caused the transaction.
Use the same definitions across engineering and operations. When investigating a problem, preserve the distinction between what was observed and what the team currently suspects caused it.
Start with an account-specific integration plan
Review CVPay's developer entry point and the applicable Vietnam or Philippines overview. Compare pay-ins and pay-outs as separate requirements.
Ready to discuss an integration? Start KYB registration or contact CVPay with your market, currencies, intended payment flow and technical questions. Use the confirmed account scope and documentation as the basis for implementation.