SP2013 JWT Token - REST POST API

Question

I need to cosume a REST API in SP2013. RESTAPI will return an JWT token as a response by calling REST POST. I need to decode and validate the JWT token at my end (SP2013) and then redirect users to certain URL's accordingly based on token expiry time.

Can we able to develop this using SP2013 designer (or) through other ways. I looked down on a certain article to consume REST API using designer (http://www.c-sharpcorner.com/article/calling-rest-api-from-a-sharepoint-designer-workflow/).

 

However , i dont think decode and validation of a token can be done in designer. Any technical advice would be greatly helpful. Looking forward your help please. Thanks.