post https://api-sandbox.y.uno/v1/payments//transactions//refund
This endpoint allows you to issue a refund for an existing payment.
If you specify an amount, a partial refund will be created. If the amount is omitted, a full refund of the original payment will be processed.
Refunds can only be created for charges that have not been refunded yet. The refunded amount will be returned to the original payment method used in the transaction.
Note that this request requires an X-Idempotency-Key. Check the Authentication page for more information.