feat: Allow SaaS users to manage subscription within the dashboard (#5059)

app/javascript/dashboard/api/enterprise/account.js

@@ -0,0 +1,18 @@
+/* global axios */
+import ApiClient from '../ApiClient';
+
+class EnterpriseAccountAPI extends ApiClient {
+  constructor() {
+    super('', { accountScoped: true, enterprise: true });
+  }
+
+  checkout() {
+    return axios.post(`${this.url}checkout`);
+  }
+
+  subscription() {
+    return axios.post(`${this.url}subscription`);
+  }
+}
+
+export default new EnterpriseAccountAPI();

app/javascript/dashboard/api/enterprise/specs/account.spec.js

@@ -0,0 +1,31 @@
+import accountAPI from '../account';
+import ApiClient from '../../ApiClient';
+import describeWithAPIMock from '../../specs/apiSpecHelper';
+
+describe('#enterpriseAccountAPI', () => {
+  it('creates correct instance', () => {
+    expect(accountAPI).toBeInstanceOf(ApiClient);
+    expect(accountAPI).toHaveProperty('get');
+    expect(accountAPI).toHaveProperty('show');
+    expect(accountAPI).toHaveProperty('create');
+    expect(accountAPI).toHaveProperty('update');
+    expect(accountAPI).toHaveProperty('delete');
+    expect(accountAPI).toHaveProperty('checkout');
+  });
+
+  describeWithAPIMock('API calls', context => {
+    it('#checkout', () => {
+      accountAPI.checkout();
+      expect(context.axiosMock.post).toHaveBeenCalledWith(
+        '/enterprise/api/v1/checkout'
+      );
+    });
+
+    it('#subscription', () => {
+      accountAPI.subscription();
+      expect(context.axiosMock.post).toHaveBeenCalledWith(
+        '/enterprise/api/v1/subscription'
+      );
+    });
+  });
+});