There are many things that can go wrong, and no one can tell anything without seeing the code, the log, request being sent by Postman that is successful, Response you are getting in SAS, etc. This question really belongs to another community (SAS programming) - especially now that you have replicated your problem in SAS EG. As a general suggestion, you can try making requests using curl command-line utility, running it directly from the SAS Compute server. If you are successful, then build on that success by having your SAS script calling curl (and processing its results). This may require enabling "X" command execution in Stored Process Server and Workspace Server options - by default it is disabled. If you are not (you can call an API with Postman, but can't do the same with curl), then your question lies even beyond any SAS tool altogether - think asking for help on sites like StackOverflow, etc. Hope this helps. Good luck!
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