post
https://api.instantpay.in/fi/remit/out/domestic/v2/transactionRefundOtp
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Header Parameters
| Name | Type | Description | Mandatory (M) , Optional (O) | Provided by INSTANTPAY (Y/N) |
|---|---|---|---|---|
| X-Ipay-Auth-Code | String | Auth Code - 1 (Fixed) | M | Y |
| X-Ipay-Client-Id | String | Unique Client ID | M | Y |
| X-Ipay-Client-Secret | String | Unique secret key | M | Y |
| X-Ipay-Outlet-Id | String | Merchant unique ID | M | Y |
| X-Ipay-Endpoint-Ip | String | End Customer IP Address | M | N |
Request Parameters
| Name | Type | Description |
|---|---|---|
| ipayId | String | Instantpay OrderID that need to be refunded |
Sample Request
curl --location 'https://api.instantpay.in/fi/remit/out/domestic/v2/transactionRefundOtp' \
--header 'X-Ipay-Endpoint-Ip: 14.142.186.142' \
--header 'X-Ipay-Client-Id: {{clientID}}' \
--header 'X-Ipay-Client-Secret: {{clientSecret}}' \
--header 'X-Ipay-Auth-Code: 1' \
--header 'X-Ipay-Outlet-Id: 525216' \
--header 'Content-Type: application/json' \
--data '{
"ipayId":"1260113092551HCQRL"
}'POST /fi/remit/out/domestic/v2/transactionRefundOtp HTTP/1.1
Host: api.instantpay.in
X-Ipay-Endpoint-Ip: 14.142.186.142
X-Ipay-Client-Id: {{clientId}}
X-Ipay-Client-Secret: {{clientSecret}}
X-Ipay-Auth-Code: 1
X-Ipay-Outlet-Id: 525216
Content-Type: application/json
Content-Length: 37
{
"ipayId":"1260113092551HCQRL"
}Response Parameters
| Name | Type | Description |
|---|---|---|
| statuscode | String | InstantPay Status Code |
| actcode | String | Action Code |
| status | String | Status Message |
| data | Array | Response Data (If Present) |
| timestamp | String | Current time (YYYY-MM-DD HH:II:SS) |
| ipay_uuid | String | Request reference number |
| orderid | String | Transaction Id ( If transaction otherwise it is null ) |
| environment | String | Live |
Sample Response
{
"statuscode": "OTP",
"actcode": null,
"status": "OTP Successfully sent",
"data": {
"validity": "2026-02-11 10:17:12",
"referenceKey": "nMSrZHVqitifXYPQmWeQV3ig6yg+ZZupZuySWHwtPM3+peB7+YcpK/Du9/LMjFNc"
},
"timestamp": "2026-02-11 10:02:12",
"ipay_uuid": "h000a10d491a-c53f-4dac-9895-0546e0f4f009-uGLawMvE4AMJ",
"orderid": null,
"environment": "LIVE",
"internalCode": null
}This OTP API call needs to be triggered only when the Remittance transaction is pending and the optional7 field contains ReversalAuthorisationRequired in the Statement or Status check API response.