[FEATURE] Make PM auth service generic across Payment Method types

[Sarthak1799]

Feature Description

Currently, PM auth only supports ACH, need to make it generic across SEPA, BACS as well.

Possible Implementation

Will probably need some kind of parent structure to differentiate between types

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!