Add GTM enhanced ecommerce transaction event to checkout

Related to:
https://gitlab.com/gitlab-com/marketing/digital-experience/buyer-experience/-/issues/271

Add the transaction enhanced ecommerce event to new subscription page,
in the confirmOrder action with successful response.

trackTransaction will only fire when the ops feature flag for
gitlab_gtm_datalayer is enabled, and GTM is running on the page.

This commit also adds/adjusts Jest specs for the GTM tracking functions.

app/assets/javascripts/google_tag_manager/index.js

+import { v4 as uuidv4 } from 'uuid';
 import { logError } from '~/lib/logger';
 
 const SKU_PREMIUM = '2c92a00d76f0d5060176f2fb0a5029ff';
@@ -19,6 +20,24 @@ const PRODUCT_INFO = {
   },
 };
 
+const generateProductInfo = (sku, quantity) => {
+  const product = PRODUCT_INFO[sku];
+
+  if (!product) {
+    logError('Unexpected product sku provided to generateProductInfo');
+    return {};
+  }
+
+  const productInfo = {
+    ...product,
+    brand: 'GitLab',
+    category: 'DevOps',
+    quantity,
+  };
+
+  return productInfo;
+};
+
 const isSupported = () => Boolean(window.dataLayer) && gon.features?.gitlabGtmDatalayer;
 
 const pushEvent = (event, args = {}) => {
@@ -162,25 +181,17 @@ export const trackCheckout = (selectedPlan, quantity) => {
     return;
   }
 
-  const product = PRODUCT_INFO[selectedPlan];
+  const product = generateProductInfo(selectedPlan, quantity);
 
-  if (!product) {
-    logError('Unexpected product sku provided to trackCheckout');
+  if (Object.keys(product).length === 0) {
     return;
   }
 
-  const selectedProductData = {
-    ...product,
-    brand: 'GitLab',
-    category: 'DevOps',
-    quantity,
-  };
-
   const eventData = {
     ecommerce: {
       checkout: {
         actionField: { step: 1 },
-        products: [selectedProductData],
+        products: [product],
       },
     },
   };
@@ -188,3 +199,34 @@ export const trackCheckout = (selectedPlan, quantity) => {
   // eslint-disable-next-line @gitlab/require-i18n-strings
   pushEnhancedEcommerceEvent('EECCheckout', 'USD', eventData);
 };
+
+export const trackTransaction = (transactionDetails) => {
+  if (!isSupported()) {
+    return;
+  }
+
+  const transactionId = uuidv4();
+  const { paymentOption, revenue, tax, selectedPlan, quantity } = transactionDetails;
+  const product = generateProductInfo(selectedPlan, quantity);
+
+  if (Object.keys(product).length === 0) {
+    return;
+  }
+
+  const eventData = {
+    ecommerce: {
+      purchase: {
+        actionField: {
+          id: transactionId,
+          affiliation: 'GitLab',
+          option: paymentOption,
+          revenue,
+          tax,
+        },
+        products: [product],
+      },
+    },
+  };
+
+  pushEnhancedEcommerceEvent('EECtransactionSuccess', 'USD', eventData);
+};

ee/app/assets/javascripts/subscriptions/new/store/actions.js

@@ -5,7 +5,7 @@ import activateNextStepMutation from 'ee/vue_shared/purchase_flow/graphql/mutati
 import createFlash from '~/flash';
 import { redirectTo } from '~/lib/utils/url_utility';
 import { sprintf, s__ } from '~/locale';
-import { trackCheckout } from '~/google_tag_manager';
+import { trackCheckout, trackTransaction } from '~/google_tag_manager';
 import defaultClient from '../graphql';
 import * as types from './mutation_types';
 
@@ -195,6 +195,16 @@ export const confirmOrder = ({ getters, dispatch, commit }) => {
   Api.confirmOrder(getters.confirmOrderParams)
     .then(({ data }) => {
       if (data.location) {
+        const transactionDetails = {
+          paymentOption: getters.confirmOrderParams?.subscription?.payment_method_id,
+          revenue: getters.totalExVat,
+          tax: getters.vat,
+          selectedPlan: getters.selectedPlanDetails?.value,
+          quantity: getters.selectedGroupUsers,
+        };
+
+        trackTransaction(transactionDetails);
+
         dispatch('confirmOrderSuccess', {
           location: data.location,
         });

ee/spec/frontend/subscriptions/new/store/actions_spec.js

@@ -9,6 +9,7 @@ import { useMockLocationHelper } from 'helpers/mock_window_location_helper';
 import testAction from 'helpers/vuex_action_helper';
 import createFlash from '~/flash';
 import axios from '~/lib/utils/axios_utils';
+import * as googleTagManager from '~/google_tag_manager';
 
 const {
   countriesPath,
@@ -553,6 +554,22 @@ describe('Subscriptions Actions', () => {
       );
     });
 
+    it('calls trackTransaction on success', async () => {
+      const spy = jest.spyOn(googleTagManager, 'trackTransaction');
+      const response = { location: 'x' };
+      mock.onPost(confirmOrderPath).replyOnce(200, response);
+
+      await testAction(
+        actions.confirmOrder,
+        null,
+        {},
+        [{ type: 'UPDATE_IS_CONFIRMING_ORDER', payload: true }],
+        [{ type: 'confirmOrderSuccess', payload: response }],
+      );
+
+      expect(spy).toHaveBeenCalled();
+    });
+
     it('calls confirmOrderError with the errors on error', async () => {
       mock.onPost(confirmOrderPath).replyOnce(200, { errors: 'errors' });
 

spec/frontend/google_tag_manager/index_spec.js

 import { merge } from 'lodash';
+import { v4 as uuidv4 } from 'uuid';
 import {
   trackFreeTrialAccountSubmissions,
   trackNewRegistrations,
@@ -9,11 +10,13 @@ import {
   trackSaasTrialProjectImport,
   trackSaasTrialGetStarted,
   trackCheckout,
+  trackTransaction,
 } from '~/google_tag_manager';
 import { setHTMLFixture } from 'helpers/fixtures';
 import { logError } from '~/lib/logger';
 
 jest.mock('~/lib/logger');
+jest.mock('uuid');
 
 describe('~/google_tag_manager/index', () => {
   let spy;
@@ -217,9 +220,9 @@ describe('~/google_tag_manager/index', () => {
 
         trackCheckout('2c92a00d76f0d5060176f2fb0a5029ff', 1);
 
-        expect(spy).toHaveBeenCalledTimes(2);
-        expect(spy).toHaveBeenCalledWith({ ecommerce: null });
-        expect(spy).toHaveBeenCalledWith({
+        expect(spy.mock.calls.flatMap((x) => x)).toEqual([
+          { ecommerce: null },
+          {
             event: 'EECCheckout',
             currencyCode: 'USD',
             ecommerce: {
@@ -238,7 +241,8 @@ describe('~/google_tag_manager/index', () => {
                 ],
               },
             },
-        });
+          },
+        ]);
       });
 
       it('with selectedPlan: 2c92a0ff76f0d5250176f2f8c86f305a', () => {
@@ -307,6 +311,82 @@ describe('~/google_tag_manager/index', () => {
         });
       });
     });
+
+    describe('when trackTransactions is invoked', () => {
+      describe.each([
+        {
+          selectedPlan: '2c92a00d76f0d5060176f2fb0a5029ff',
+          revenue: 228,
+          name: 'Premium',
+          id: '0002',
+        },
+        {
+          selectedPlan: '2c92a0ff76f0d5250176f2f8c86f305a',
+          revenue: 1188,
+          name: 'Ultimate',
+          id: '0001',
+        },
+      ])('with %o', (planObject) => {
+        it('invokes pushes a new event that references the selected plan', () => {
+          const { selectedPlan, revenue, name, id } = planObject;
+
+          expect(spy).not.toHaveBeenCalled();
+          uuidv4.mockImplementationOnce(() => '123');
+
+          const transactionDetails = {
+            paymentOption: 'visa',
+            revenue,
+            tax: 10,
+            selectedPlan,
+            quantity: 1,
+          };
+
+          trackTransaction(transactionDetails);
+
+          expect(spy.mock.calls.flatMap((x) => x)).toEqual([
+            { ecommerce: null },
+            {
+              event: 'EECtransactionSuccess',
+              currencyCode: 'USD',
+              ecommerce: {
+                purchase: {
+                  actionField: {
+                    id: '123',
+                    affiliation: 'GitLab',
+                    option: 'visa',
+                    revenue,
+                    tax: 10,
+                  },
+                  products: [
+                    {
+                      brand: 'GitLab',
+                      category: 'DevOps',
+                      id,
+                      name,
+                      price: revenue,
+                      quantity: 1,
+                      variant: 'SaaS',
+                    },
+                  ],
+                },
+              },
+            },
+          ]);
+        });
+      });
+    });
+
+    describe('when trackTransaction is invoked', () => {
+      describe('with an invalid plan object', () => {
+        it('does not get called', () => {
+          expect(spy).not.toHaveBeenCalled();
+
+          trackTransaction({ selectedPlan: 'notAplan' });
+
+          expect(spy).not.toHaveBeenCalled();
+        });
+      });
+    });
   });
 
   describe.each([