1
Pick the account to send from
id and the platform. An account can only send when capabilities includes message:send.2
Send a message
Send to a platform user by their ID on that platform. Inboxapp finds the conversation or starts one.The response has the
message and the thread it landed in. Store thread.id for the next step.Messaging someone who isn’t one of your contacts yet needs the Advanced API
add-on. Without it, the request fails with
403 planRequired.3
Read the conversation
direction is outbound for messages your account sent and inbound for replies.4
Reply in the same thread
Next steps
Core concepts
Profiles, contacts, threads and capabilities
Working with messages
Targets, retries, edits and reactions
Webhooks
Get replies as they arrive
Error codes
What each failure means