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Response envelope

Every response uses the same envelope:
Always check code as well as the HTTP status.

Pagination

List endpoints accept page and limit query parameters and return a page object in data:

Asynchronous operations

Card operations such as create, top up, withdraw, freeze, unfreeze and close are processed asynchronously. The API accepts the request and returns a transaction ID; the final result is delivered to your webhook. Pass your own clientTransactionId on these requests to match webhooks to your records. If you omit it, the API generates one and returns it.