curl --location --request POST 'https://your-api-server.com' \
--header 'api-key: <api-key>'{
"packageId": "pkg-id",
"channelId": "your-channel-id",
"content": {
"type": "MESSAGE_DELIVERED",
"messageIds": [
"3EB0B53599861B79017554"
],
"timestamp": "2025-12-01T23:30:10.9326234+00:00"
},
"timestamp": "2025-12-01T23:30:10.9520053+00:00"
}