Update list of supported Google Pay gateways.

[barbieri]

There are more gateways, not just braintree and stripe.

[barbieri]

I had to update the list to use a different gateway, however it may be good to not call validateGateway(), instead let the API be called and return a failure if it's unsupported... this will avoid problems like I had... being more extensible as Google will likely add more partners.

[Andreyco]

Are these gateways supported by default on Android? No need to setup SDKs for those addons?

[barbieri]

There is no need for an SDK if all you do is to get the reply (ie: paymentToken) and send to your server.

For instance I use firstdata (PayEezy): https://developer.payeezy.com/payeezy-api/apis/post/transactions-18 and its 3DS field is basically what comes in paymentToken:

Payeezy's 3DS:

{
    "signature": "...",
    "type": "G",
    "version": "ECv1",
    "data": "{\"encryptedMessage\":\"...\",\"ephemeralPublicKey\":\"...\",\"tag\":\"...\"}"
  }

React-Native-Payment's getPaymentToken() results:

{
  "signature": "...",
  "protocolVersion": "ECv1",
  "signedMessage": "{\"encryptedMessage\":\"...\",\"ephemeralPublicKey\":\"...\",\"tag\":\"...\"}"
}

[barbieri]

ping?

[kirillpisarev]

This should be merged, otherwise there is no way to integrate almost all gateways from available list as mentioned @barbieri.

[nabilfreeman]

Hey @barbieri , thanks so much for this PR, especially your follow up comments. I understand that the functionality of Google Pay is pretty different from Apple Pay and this needs a re-think. I'm maintaining this library and studying a bit, will get back to this soon.

[nabilfreeman]

@kirillpisarev are you around? This was a long time ago but would like to know if this is still the right way to approach supporting gateways for Google Pay.

[kirillpisarev]

@nabilfreeman i wish i could help you, but i can't remember the point of the issue and i don't have access to the source code of the project i was working on...

[kirillpisarev]

As far as i remember the supported gateways could be omitted, because the list actually is pretty big and there is no reason to keep it in the code

[TonchoLozev]

checkoutltd would be great to be added