here an simple Sample of how to use TIBCO® Cloud Integration (TCI) and Postman in 4 Steps.
Step 1: create a Project with TIBCO® Cloud Integration Business Studio
e.g. here a dummy Service to validate a IBAN Number in a bigger Banking Procedure
Step 2: Publish your Service to the Cloud
Step 3: Test your Service within TCI
Step 4: Test your Service using Postman