Add capabilityCredit and capabilityDebit merchantCapability options for Apple Pay

[brendanlong]

These allow developers to pass capabilityCredit: true or capabilityDebit: true when opening an Apple Pay interface to filter to only credit or debit cards.

See: https://developer.apple.com/documentation/apple_pay_on_the_web/applepaypaymentrequest/1916123-merchantcapabilities

Fixes #728

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Brendan Long seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[brendanlong]

I doubt this is exactly how you want to implement this, but I figured example code would make it easier to find this if you do want to do it.

[charliecruzan-stripe]

It would also be good to see if Google Pay exposes a similar filter so we have cross-platform support for this feature: https://developers.google.com/pay/api/android/guides/tutorial#allowed-payment-methods

[charliecruzan-stripe]

This is now released in v0.22.0 via https://github.com/stripe/stripe-react-native/pull/1164

[jayfeldman12]

I might be missing something, but I don't see where the option to specify only credit or debit was done. In presentParams I don't see a field relevant to this.

[charliecruzan-stripe]

This is released as part of the new Platform Pay API, which replaced the individual Apple/Google Pay APIs: https://github.com/stripe/stripe-react-native/blob/master/src/types/PlatformPay.ts#L65