[FEATURE] onboard customer's bank details using /payment_methods CREATE

[kashif-m]

Feature Description

Add capability to onboard customers and their bank details prior to making a txn.

Current State
Only card payment method can be persisted using /payment_methods endpoint. A txn has to be completed for persisting bank details.

Use case
Use payment_tokens for initiating a bank txn.

Possible Implementation

Add capability in /payment_methods CREATE API to persist bank details.

Have you spent some time checking if this feature request has been raised before?

• I checked and didn't find a similar issue

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

Are you willing to submit a PR?

Yes, I am willing to submit a PR!

[kashif-m]

This is merged and deployed in sandbox.