Fix VB.NET API Error

My VB.NET desktop application throws a data-retrieval error every time it calls our private API for transaction records. The authentication handshake succeeds and the connection stays open, but the moment I hit the endpoint that should return the records, I receive a fault response and no data.

What I can share right away
• Current VB.NET function that builds the request
• Sample JSON the API is supposed to return
• The exact error payload I receive

What I need from you
• Identify the root cause of the data retrieval failure
• Patch or refactor the VB.NET code so the API returns the expected transaction records reliably
• Provide a concise summary of the fix so I can duplicate the solution in staging and production environments

Acceptance
When the application successfully pulls the full set of transaction records without throwing an exception, the task is done. If a mock endpoint helps you test, let me know and I’ll spin one up.