How do I get a list of Fields on Operational Reporting API with its full metadata?

To get the field names, data types, description, precision, and scale/size you must invoke the /metadata end points with the proper parameters.

1. jsonSchema = true
2. includeCustomFields = true
3. includeFieldName = true
4. includeFieldDescription = true

Read more on API Documentation.

Core Procurement > Procurement REST APIs
Purchasing
Spend Visibility
Strategic Sourcing > Strategic Sourcing - REST API