curl --location 'https://your-api-server.com' \
--header 'X-Webhook-Signature: sha256=5d41402abc4b2a76b9719d911017c5925d41402abc4b2a76b9719d911017c592' \
--header 'X-Webhook-Event: checkout.paid' \
--header 'X-Webhook-Idempotency-Key: 3b1f6c2e-8a4d-4f7b-9c1e-2d5a6b7c8d9e' \
--header 'User-Agent;' \
--header 'Content-Type: application/json' \
--data '{
"version": "v1",
"event_type": "test.event",
"timestamp": "2026-03-26T12:30:00.000000Z",
"idempotency_key": "3b1f6c2e-8a4d-4f7b-9c1e-2d5a6b7c8d9e",
"merchant_id": "7a9c2e4b-1d3f-4a6b-8c0e-5f2a1b3c4d5e",
"data": {
"source": "portal"
}
}'