Consume REST API from Document of Record Attribute

Summary:

I need a way to trigger an API service from an attribute within a document of record. My requirement is that once a user initiates the creation of a document of record, one of its attributes should automatically call a REST API to retrieve a specific value and store it in that attribute. I need a way to trigger an API service from an attribute within a document of record. My requirement is that once a user initiates the creation of a document of record, one of its attributes should automatically call a REST API to retrieve a