Post a message to a specific conversation

This operation posts a message in a conversation as specified by the conversationId. You can retrieve the conversationId by listing the conversations for a contact or by listing all conversations in the organization. You can also send messages to a phone number, an email address or securely message a contact using a specific internal endpoint.

You can also use this API to post messages into a Team or Note conversations. For Note conversations, you will have to specify Internal=true since only internal messages can be posted in Note conversations.

NOTE: Message attachments are not yet supported in the API.