Draw a Sequence Diagram: a user creates a support request in the system, the request is saved in the database, it goes for registration in CRM, receives a registration number, which is recorded back. The user only sees the CRM number, the internal ID is not shown.

plaintext Sequence Diagram:

User -> Support System: Creates a request Support System -> Database: Saves the request (internal ID) Support System -> CRM System: Sends the request for registration CRM System -> Support System: Returns the registration number Support System -> Database: Updates the request with the registration number Support System -> User: Shows only the registration number

Description:

• User creates a request through the support interface.
• The system saves the request in the database, assigning an internal ID.
• Then the request is sent to CRM for registration.
• CRM returns a unique registration number.
• The system updates the database record, adding the registration number.
• Only the registration number is displayed to the user, the internal ID is hidden.