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();