curl --location 'https://sandbox.mypaygateway.io/webhooks/mypay' \
--header 'X-Webhook-Signature: 3d4a5b6c7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b' \
--header 'Content-Type: application/json' \
--data '{
"paymentLinkId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
"transactionId": "10805652794",
"amount": 150,
"currency": "USD",
"paidAt": "2026-05-09T10:23:15.123Z",
"reference": "ORD-2026-0042"
}'{
"received": true
}