Payment Method allowed in India

Thanks for clarifying that. Regardless, as you can see, Apple does not have an agreement with other financial institutions in India other than those two you mention.

You can certainly try getting additional help with this by contacting Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.

Payment methods for what exactly? To be associated with your Apple ID and/or to add to the Apple Wallet? Regardless, Apple does not determine what payment methods are accepted. The issuing credit institutions do.

Ref: Payment methods you can use with your Apple ID - Apple Support