[WIP] Amazon refactor to lib (#8403)

* Moved amazon tests to folder

* Abstracted amazon payment code and added initial test

* Abstracted cancel and subscribe logic to amazon payment lib

* Added arg checks to checkout

* Added constants. Added more subscription test

* Added with arg checks to cancel

* Fixed linting issues

* Added integration tests for amazon subscribe cancel

* Added integration test for amazon checkout

* Added integration test for amazon subscribe

* Added coupon unit test

* Fixed lint

* Fixed minor test issue and changed header expectations

* Fixed line endings

website/server/controllers/api-v3/groups.js

@@ -22,6 +22,7 @@ import { sendNotification as sendPushNotification } from '../../libs/pushNotific
 import pusher from '../../libs/pusher';
 import common from '../../../common';
 import payments from '../../libs/payments';
+import amzLib from '../../libs/amazonPayments';
 import shared from '../../../common';
 
 
@@ -175,7 +176,7 @@ api.createGroupPlan = {
       let groupId = savedGroup._id;
       let headers = req.headers;
 
-      await payments.subscribeWithAmazon({
+      await amzLib.subscribe({
         billingAgreementId,
         sub,
         coupon,