Payment Notifications Callbacks

After a given payment transaction has been issued by one of your clients through any of our payment channels, we will make sure that you are kept updated with the status of your transaction. OPay delivers an informative, and secure notification callback solution to keep our valued merchants informed once the status of their respective transactions have been updated.

All you need is to create your callback endpoint on your side to handle OPay's notification callback request. Creating an endpoint to receive callbacks on your application is as easy as creating a new page that accepts unauthenticated POST requests. The callback object is sent as a JSON object in the request body.

Since anyone can get hold of your endpoint and attempt to send you phony event objects for malicious purposes (e.g. to see if they can mark their subscription to your product as renewed just in case you aren't running any verifications on the transaction reference), it is important to verify that callbacks originate from OPay.

You can do any or both of the below to verify callbacks from OPay

• Watch the IPs and accept callbacks only from our IPs.
• Validate the Signature as described in the section that follows.

Responding to a callback

You should respond to a callback with a 200 OK. We consider this an acknowledgement by your application. If your application responds with any status outside of the 2xx range, we will consider it unacknowledged and thus, continue to send it for 72 hours. You don't need to send a request body or some other parameter as it would be discarded - we only pay attention to the status code.

Structure of a callback object

A callback object is sent in JSON and similar to what you would get in response to a typical API request. Below is the body of a callback.

Example Response

                        
                             {
                               "payload":{
                                  "amount":"49160",
                                  "channel":"Web",
                                  "country":"NG",
                                  "currency":"NGN",
                                  "displayedFailure":"",
                                  "fee":"737",
                                  "feeCurrency":"NGN",
                                  "instrumentType":"BankCard",
                                  "reference":"10023",
                                  "refunded":false,
                                  "status":"SUCCESS",
                                  "timestamp":"2022-05-07T06:20:46Z",
                                  "token":"220507145660712931829",
                                  "transactionId":"220507145660712931829",
                                  "updated_at":"2022-05-07T07:20:46Z"
                               },
                               "sha512":"9f605d69f04e94172875dc156537071cead060bbcaeaca94a7b8805af9f89611e2fdf6836713c9c90b028ca7e4470b1356e996975f2abc862315aaa9b7f2ae2d",
                               "type":"transaction-status"
                            }
                        
                

Response Parameters Description