feat: add regex for UnionPay and allow card number checking if cardbrand not detected

[aritro2002]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

This update enhances our card validation logic by adding regex support for UnionPay and allow card number checking if cardbrand not detected.

The UnionPay regex pattern and pin was derived from the following sources:

1. https://github.com/validatorjs/validator.js/blob/a1e84761802e050ed5d0e3d138e8f87cc1564860/src/lib/isCreditCard.js#L10
2. https://en.wikipedia.org/wiki/Payment_card_number
3. https://www.mystoredemo.io/#/checkout
4. https://m.unionpayintl.com/wap/en/serviceCenter/cardUsingInstructions/1439.shtml

How did you test it?

I have checked it by running the local React demo app.

If the card brand is not detected but the card number is valid (passes the Luhn test and falls within the valid card number length range), we allow the user to make a payment. We send card_network as null.

I have also changed the default pattern, as many card brands have different CVC and card number lengths.

I have removed checkIsTestCardWildcard, as it is passing luhn test.

Checklist

• I ran npm run re:build
• I reviewed submitted code
• I added unit tests for my changes where possible

[semanticdiff-com]

Review changes with  

[PritishBudhiraja]

let cardNetwork = [
  ("card_network", cardBrand != "" ? cardBrand->JSON.Encode.string : JSON.Encode.null),
]

[aritro2002]

Done

[PritishBudhiraja]

let cardNetwork = [
  ("card_network", cardBrand != "" ? cardBrand->JSON.Encode.string : JSON.Encode.null),
]

[aritro2002]

Done