Hi @aparna1 ,
Kindly have a look on the below links for SoftwareAG webMethods Product to understand and use REST.
Note : The webMethods Product is now owned by IBM
https://documentation.softwareag.com/webmethods/compendiums/v10-3/C_B2B_Integration/index.html#page/b2b-integration-compendium%2Fhelp_working_with_REST.html%23