add UI for stripe_v2

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

@@ -6,6 +6,7 @@ class EnterpriseAccountAPI extends ApiClient {
     super('', { accountScoped: true, enterprise: true });
   }
 
+  // V1 endpoints
   checkout() {
     return axios.post(`${this.url}checkout`);
   }
@@ -23,6 +24,49 @@ class EnterpriseAccountAPI extends ApiClient {
       action_type: action,
     });
   }
+
+  // V2 Billing endpoints
+  get v2BillingUrl() {
+    const accountId = this.accountIdFromRoute;
+    return `/enterprise/api/v2/accounts/${accountId}/billing`;
+  }
+
+  getCreditGrants() {
+    return axios.get(`${this.v2BillingUrl}/credit_grants`);
+  }
+
+  getPricingPlans() {
+    return axios.get(`${this.v2BillingUrl}/pricing_plans`);
+  }
+
+  getTopupOptions() {
+    return axios.get(`${this.v2BillingUrl}/topup_options`);
+  }
+
+  topupCredits(credits) {
+    return axios.post(`${this.v2BillingUrl}/topup`, { credits });
+  }
+
+  subscribeToPlan(pricingPlanId, quantity) {
+    return axios.post(`${this.v2BillingUrl}/subscribe`, {
+      pricing_plan_id: pricingPlanId,
+      quantity,
+    });
+  }
+
+  cancelSubscription(reason = null, feedback = null) {
+    return axios.post(`${this.v2BillingUrl}/cancel_subscription`, {
+      reason,
+      feedback,
+    });
+  }
+
+  changePricingPlan(pricingPlanId, quantity) {
+    return axios.post(`${this.v2BillingUrl}/change_pricing_plan`, {
+      pricing_plan_id: pricingPlanId,
+      quantity,
+    });
+  }
 }
 
 export default new EnterpriseAccountAPI();