# 4. Performing a refund

> When performing multiple refund transactions simultaneously, at least a 5-second delay should be introduced between consecutive transactions.

> The refund is performed for the highest-value transaction assigned to the given payment. This action can be performed before the payment is fully completed.

A refund is correctly performed by sending a POST request to the address: 

```
https://api.axepta.pl/v1/merchant/{merchantId}/payment/{paymentId}/refund
```

where:  

- `merchantId` - client identifier,
- `paymentId` - unique identifier of the payment to which the refund applies.