Implementing Decline reason requirement in OTM as Mandatory?

Summary:

What is the approach in implementing the decline reason requirement as mandatory when the shipment is declined, and what are the ways to develop the solution?

Content (please ensure you mask any confidential information):

The requirement is to mandate the reason code and to provide the reason by the carrier, when the shipment is declined.

Version (include the version you are using, if applicable):

24B

Code Snippet (add any code snippets that support your topic, if applicable):