Posts a new chat message on a case, visible to both the collection partner and the creditor.

Message Details:

• The message is attributed to the team member identified by userId
• The creditor will receive an email notification about the new message
• A task is created in the Debitura platform for the creditor to review the message
• Messages appear in the case chat timeline in chronological order

Prerequisites:

• The case must exist and be assigned to you as collection partner
• The case must have passed Debitura approval and contract signing
• For a test or demo managed case, the managing partner may save case context during review
• The userId must be a valid user ID from GET /users belonging to your team

Use Case: Use this endpoint to communicate with creditors about case progress, request additional information, or provide status updates. Messages sent via this endpoint are equivalent to messages sent through the partner portal chat.

{
  "message": "Please provide the signed contract for this case.",
  "userId": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "userEmail": "john.doe@example.com"
}