Sample Rest API to update requester on purchase order distributions

Summary:

Need a Sample Rest API to update requester on purchase order distributions

Content (required):

Our Client has just gone live with Procurement and Financials cloud and we are required to update the requester on purchase order for 1200 odd purchase orders. Need your help in giving us a sample Rest API to update requester in purchase order distributions. I am using the one provided in the snippet but it says 404:Not found(bad resource type) while trying through postman

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

23B

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