Stripe: upgrade module and API, switch to Checkout (#12785)

* upgrade stripe module

* switch stripe api to latest version

* fix api version in tests

* start upgrading client and server

* client: switch to redirect

* implement checkout session creation for gems, start implementing webhooks

* stripe: start refactoring one time payments

* working gems and gift payments

* start adding support for subscriptions

* stripe: migrate subscriptions and fix cancelling sub

* allow upgrading group plans

* remove console.log statements

* group plans: upgrade from static page / create new one

* fix #11885, correct group plan modal title

* silence more stripe webhooks

* fix group plans redirects

* implement editing payment method

* start cleaning up code

* fix(stripe): update in-code docs, fix eslint issues

* subscriptions tests

* remove and skip old tests

* skip integration tests

* fix client build

* stripe webhooks: throw error if request fails

* subscriptions: correctly pass groupId

* remove console.log

* stripe: add unit tests for one time payments

* wip: stripe checkout tests

* stripe createCheckoutSession unit tests

* stripe createCheckoutSession unit tests

* stripe createCheckoutSession unit tests (editing card)

* fix existing webhooks tests

* add new webhooks tests

* add more webhooks tests

* fix lint

* stripe integration tests

* better error handling when retrieving customer from stripe

* client: remove unused strings and improve error handling

* payments: limit gift message length (server)

* payments: limit gift message length (client)

* fix redirects when payment is cancelled

* add back "subUpdateCard" string

* fix redirects when editing a sub card, use proper names for products, check subs when gifting

test/api/unit/libs/payments/apple.test.js

@@ -5,6 +5,7 @@ import applePayments from '../../../../../website/server/libs/payments/apple';
 import iap from '../../../../../website/server/libs/inAppPurchases';
 import { model as User } from '../../../../../website/server/models/user';
 import common from '../../../../../website/common';
+import * as gems from '../../../../../website/server/libs/payments/gems';
 
 const { i18n } = common;
 
@@ -15,7 +16,7 @@ describe('Apple Payments', () => {
     let sku; let user; let token; let receipt; let
       headers;
     let iapSetupStub; let iapValidateStub; let iapIsValidatedStub; let paymentBuyGemsStub; let
-      iapGetPurchaseDataStub;
+      iapGetPurchaseDataStub; let validateGiftMessageStub;
 
     beforeEach(() => {
       token = 'testToken';
@@ -36,6 +37,7 @@ describe('Apple Payments', () => {
           transactionId: token,
         }]);
       paymentBuyGemsStub = sinon.stub(payments, 'buyGems').resolves({});
+      validateGiftMessageStub = sinon.stub(gems, 'validateGiftMessage');
     });
 
     afterEach(() => {
@@ -44,6 +46,7 @@ describe('Apple Payments', () => {
       iap.isValidated.restore();
       iap.getPurchaseData.restore();
       payments.buyGems.restore();
+      gems.validateGiftMessage.restore();
     });
 
     it('should throw an error if receipt is invalid', async () => {
@@ -143,6 +146,7 @@ describe('Apple Payments', () => {
         expect(iapIsValidatedStub).to.be.calledOnce;
         expect(iapIsValidatedStub).to.be.calledWith({});
         expect(iapGetPurchaseDataStub).to.be.calledOnce;
+        expect(validateGiftMessageStub).to.not.be.called;
 
         expect(paymentBuyGemsStub).to.be.calledOnce;
         expect(paymentBuyGemsStub).to.be.calledWith({
@@ -180,6 +184,9 @@ describe('Apple Payments', () => {
       expect(iapIsValidatedStub).to.be.calledWith({});
       expect(iapGetPurchaseDataStub).to.be.calledOnce;
 
+      expect(validateGiftMessageStub).to.be.calledOnce;
+      expect(validateGiftMessageStub).to.be.calledWith(gift, user);
+
       expect(paymentBuyGemsStub).to.be.calledOnce;
       expect(paymentBuyGemsStub).to.be.calledWith({
         user,