{"id": "<unique message identifier>","from": "<phone number of the channel>","to": "<phone number of the user>","timestamp": "<timestamp>","type": "text","text": {"body":"Hello world" }}
Image message
{"id": "<unique message identifier>","from": "<phone number of the channel>","to": "<phone number of the user>","timestamp": "<timestamp>","type": "image","image": {"url":"your-media-url","caption":"your-image-caption","mimeType":"<see the list of available mimeType>" }}
Document message
{"id": "<unique message identifier>","from": "<phone number of the channel>","to": "<phone number of the user>","timestamp": "<timestamp>","type": "document","document": {"url":"your-document-url","caption":"your-document-caption","mimeType":"<see the list of available mimeType>" }}
Voice message
{"id": "<unique message identifier>","from": "<phone number of the channel>","to": "<phone number of the user>","timestamp": "<timestamp>","type": "voice","voice": {"url":"your-voice-url","mimeType":"<see the list of available mimeType>" }}