Is it possible to implement REST Services in Pega 5.3 version? OOTB it is not available.Is it worth doing research/POC on this implementation in 5.3 or upgrading the application to pega 7 is the easiest way?
***Updated by Moderator: Marissa. Removed user added Ask the Expert group tag. Apologies for confusion, shouldn't have been an end-user option; updated categories***
You can probably use a HTTP-CONNECTOR to get at the endpoints (REST is easy at that level) - but I assume you need to map JSON back into PRPC properties - and there is no facility in PRPC53 to do that.
If your REST endpoint happens to use XML rather than JSON, you might be able to do this using PARSE XML rules.
But really: your best option (not only for the REST stuff!) is to upgrade to Pega7 !