certificate has expired in SMS Gateway Configuration

Dear all, I was using AWS lambda as an SMS gateway which was connected to DHIS2 for SMS submissions. The SSL on the DHIS2 was changed and now I am receiving this error on my SMS gateway: ** to_number": "2840", "from_number": "+23275569229", "id": "bedaad69-0b3b-4d72-af5a-e6356a570b08", "time": "2023-04-06T17:14:12.148", "reqid": "3f4cd034-ac99-4528-980b-3a046de5a855", "direction": "incoming", "status": "error", "wasCompressed": true, "error": { "name": "Error", "message": "certificate has expired", "code": 422 } }, "level": "error", "label": "sms-gateway-prod", "timestamp": "2023-04-06T17:14:17.984Z"**

Please can someone help me with solution how to fix this issue.