| Name | Type | Description | Notes |
|---|---|---|---|
| transaction | str | Transaction reference or id | |
| amount | int | Amount ( in kobo if currency is NGN, pesewas, if currency is GHS, and cents, if currency is ZAR ) to be refunded to the customer. Amount cannot be more than the original transaction amount | [optional] |
| currency | str | Three-letter ISO currency. Allowed values are NGN, GHS, ZAR or USD | [optional] |
| customer_note | str | Customer reason | [optional] |
| merchant_note | str | Merchant reason | [optional] |