# Refund payment by Id

Refunds all or part of the amount of a payment. This operation can only be carried out in businesses that collect in a Khipu account and before the corresponding funds are delivered.

Endpoint: POST /v3/payments/{id}/refunds
Version: v3.0
Security: Api-Key

## Path parameters:

  - `id` (string, required)
    Payment identifier

## Request fields (application/json):

  - `amount` (number)
    The amount to be returned. Without thousands separator and using '.' as a decimal separator. Up to 4 decimal places, depending on currency. If it is omitted, the refund will be made for the total payment amount.
    Example: 1000

## Response 200 fields (application/json):

  - `message` (string, required)
    Message to be displayed to the user.
    Example: "Message."