[FEATURE] expose tokenize endpoints

[kashif-m]

Feature Description

HS backend to expose endpoints to help with tokenization of customer's cards. HyperSwitch makes use of an external service which helps tokenize the card and makes it usable within HS ecosystem. Once tokenized, these cards can be used in a PG agnostic manner as they're tokenized with the card networks.

Possible Implementation

Expose two endpoints

• /payment_methods/tokenize-card
• /payment_methods/tokenize-card-batch

The flow looks like -

• Create / update customer
• Tokenize card with the network (through external service)
• Create a payment method entry in HS storing the required references from external service
• Return response

For batch tokenization, above steps will be executed for every card to be tokenized. Any errors encountered during this operation will be aggregated and returned back in the response.

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!