I am also facing the same issue. ICICI Rubyx Rupay Credit Card. Everything works except the online merchant transactions. Fails for all merchants. The customer care team says everything is fine and declined transactions cannot be seen on their portal. All transactions fail regardless of the amount. I have tried with as low as 10 to as high as 25000 and all of them fail.
Any help to get this working?
@Abhishek012 : What did you do to get this working?