Onboard on ONDC - step post whitelisting

curl --location --request POST 'subscribe' \
--header 'Content-Type: application/json' \
--data-raw '{
    "context": {
        "operation": {
            "ops_no": 1
        }
    },
    "message": {
        "request_id": "26caa60d-d761-49d8-a8e5-33aec2aad0ce",
        "timestamp": "2025-06-09T19:00:18.435Z",
        "entity": {
            "gst": {
                "legal_entity_name": "Wayne Enterprises",
                "business_address": "1007 Mountain Drive, Gotham, NJ 07001",
                "city_code": [
                    "std:080"
                ],
                "gst_no": "07BRUCE1234B1Z7"
            },
            "pan": {
                "name_as_per_pan": "Wayne Enterprises",
                "pan_no": "BATMN0077Q",
                "date_of_incorporation": "01/04/1939"
            },
            "name_of_authorised_signatory": "Lucius Fox",
            "address_of_authorised_signatory": "Wayne Tower, 18th Floor, Gotham, NJ 07001",
            "email_id": "lucius.fox@wayne.com",
            "mobile_no": 9876543210,
            "country": "IND",
            "subscriber_id": "sit.grab.in",
            "unique_key_id": "26caa60d-d761-49d8-a8e5-33aec2aad0ce",
            "callback_url": "/",
            "key_pair": {
                "signing_public_key": "QSax2KT4UiTUWUqoVUaEcWhBcGTTNu+Sf8EMDRY1GaE=",
                "encryption_public_key": "O74ukMymk4KZnVs3sZhU2U7RXpaZ/qiOUMk5NWt6rbI=",
                "valid_from": "2025-06-09T19:00:18.435Z",
                "valid_until": "2032-06-09T19:00:18.435Z"
            }
        },
        "network_participant": [
            {
                "subscriber_url": "/",
                "domain": "ONDC:RET10",
                "type": "buyerApp",
                "msn": false,
                "city_code": [
                    "std:080"
                ]
            }
        ]
    }
}'