feat(connector): add support for affirm and afterpay/clearpay through stripe

[Narayanbhat166]

Feature Description

Add support for creating payments through affirm and afterpay/clearpay through stripe. The api contract changes will be as follows

• afterpay/clearpay

{
  "payment_method": "pay_later",
  "payment_method_data": {
    "issuer_name": "afterpay_clearpay",
    "afterpay_clearpay_redirect": {
      "billing_email_address": "[email protected]"
    }
  }
}

• affirm

{
  "payment_method": "pay_later",
  "payment_method_data": {
    "issuer_name": "affirm",
    "affirm_redirect": {
      "billing_email_address": "[email protected]"
    }
  }
}

Possible Implementation

Modify the payments request of stripe to include affirm and afterpay

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

• [X] I checked and didn't find similar issue

Have you read the Contributing Guidelines?

• [X] I have read the Contributing Guidelines

Are you willing to submit a PR?

Yes I am willing to submit a PR!

• [X] Support for affirm #355
• [ ] Support for afterpay_clearpay

[bernard-eugine]

@Narayanbhat166 We can standardize the payment request body for redirection flows of applicable pay_later like affirm, afterpay and klarna:

• Include email as a field inside the address struct. Thus, billing_email will be a field under billing field in Payments request.
• Use the billing details required for pay_later redirection flow from the billing_details field passed outside the payment_method_data field in payments request body. Thus, we will avoid repetition of same fields in multiple places and also, this helps us avoid unnecessary usage of locker due to passing data in the payment_method_data field.
• Use payment_experience field in payment request to indicate whether it is redirection or SDK flow.

Sample Payment Request with necessary fields for pay_later redirect experience:

{
  "amount": 123,
  "currency": "USD",
  "payment_method": "pay_later",
  "payment_method_issuer": "klarna",
  "payment_experience": "redirect_to_url",
  "billing": {
    "name": "...",
    "email": "...",
    "address": "...",
    "phone": "..."
  },
  "shipping": {
    "name": "...",
    "email": "...",
    "address": "...",
    "phone": "..."
  }
}

[Narayanbhat166]

There is an email field in the payments request struct which was added by @zereraz when adding cybersource connector. The same field can be used for email. But if a separate billing and shipping email is needed then it has to be added to the address struct.

[Narayanbhat166]

Will take this up in a separate PR since it requires changes to all pay_later payments which go through stripe. Currently merging #441 will close this issue.