Webhook
Send Conversation API events to your custom webhook endpoint.
This category has a single event-based operation, Custom Webhook Endpoint, which describes the request your webhook receives for every inbound message and the response format it must return. Since each messaging channel has its own feature set and limits, the Channels Features page documents which message and button types, file sizes, and text lengths are supported per channel, so your webhook implementation can either target the common denominator or tailor the response per channel.