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post
/channels/{channel_id}/incoming_messages
Receive custom messages
post
/channels/{channel_id}/messages
Create message
post
/conversations/{conversation_id}/messages
Create message reply
post
/inboxes/{inbox_id}/imported_messages
Import message
get
/messages/{message_id}
Get message
get
/messages/{message_id}/seen
Get message seen status
post
/messages/{message_id}/seen
Mark message seen
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Changes to Mark message seen
post
/messages/{message_id}/seen
Nov 3, 2026
d5ddea1da69e
Revision changes
breaking
request body became required