Called to initiate a new refund transaction from your backend. Multiple partial refund transactions are allowed, however we ensure that the value of the current refund request plus the sum of previous refunds values never exceeds the value of the associated payment transaction.

Note that a valid checkout-api-key header should be included on the request, otherwise you will receive an unauthorized error. Your API key can be obtained from the Business Portal integration tab. This endpoint should be called on the server-side to prevent exposing your API key.

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