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You need an Inboxapp team with at least one linked account, and an API token.
1

Pick the account to send from

Keep the 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

Messages come newest first. 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