What a reliable payment integration needs

Connecting a payment button is only the visible part of checkout. A complete integration connects the order, the transaction and the actions taken after payment. Corevelt plans these responsibilities before implementing the gateway connection.

Separate order and transaction states

An order can exist without a successful payment. A transaction can be pending, failed or refunded after an order is created. Record the gateway reference and the amount and currency associated with each attempt. Decide when fulfilment is allowed to begin and how staff can investigate incomplete transactions.

Verify on the server

A browser returning to a success page does not establish that payment was completed. Use the gateway-supported server verification process and authenticate incoming notifications according to its documentation. Check the transaction against the expected order, amount and currency before updating business records.

Expect repeated notifications

A provider may retry a notification, and a customer may refresh a page. Processing the same transaction again should not create a second booking, send another fulfilment request or duplicate an accounting entry. Store a stable transaction identifier and make repeated processing safe.

Plan recovery and support

• Show clear pending and failed states.
• Keep technical logs separate from public messages.
• Provide a way to reconcile gateway and order records.
• Test refunds and cancellations as well as successful payments.

Gateway credentials, test accounts and release responsibilities belong in the project plan. Confirm the complete checkout flow in a test environment before enabling live transactions.