feat: update message structure

[laumair]

Description of change

This PR updates message structure and ensures it matches the updated one in wallet.rs.

Links to any relevant issues

N/A

Type of change

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

Manually tested macOS by receiving a message.

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes