Return discount info in Subscription responses [AC-1657] (#3278)

* Return whether customer has Stripe discount applied from /api/accounts/subscription

* Return whether customer has Stripe discount applied from /api/organizations/{id}/subscription

src/Api/Models/Response/Organizations/OrganizationResponseModel.cs

@@ -116,6 +116,7 @@ public class OrganizationSubscriptionResponseModel : OrganizationResponseModel
     {
         Subscription = subscription.Subscription != null ? new BillingSubscription(subscription.Subscription) : null;
         UpcomingInvoice = subscription.UpcomingInvoice != null ? new BillingSubscriptionUpcomingInvoice(subscription.UpcomingInvoice) : null;
+        Discount = subscription.Discount != null ? new BillingCustomerDiscount(subscription.Discount) : null;
         Expiration = DateTime.UtcNow.AddYears(1); // Not used, so just give it a value.
 
         if (hideSensitiveData)
@@ -146,6 +147,7 @@ public class OrganizationSubscriptionResponseModel : OrganizationResponseModel
 
     public string StorageName { get; set; }
     public double? StorageGb { get; set; }
+    public BillingCustomerDiscount Discount { get; set; }
     public BillingSubscription Subscription { get; set; }
     public BillingSubscriptionUpcomingInvoice UpcomingInvoice { get; set; }
 

src/Api/Models/Response/SubscriptionResponseModel.cs

@@ -14,6 +14,7 @@ public class SubscriptionResponseModel : ResponseModel
         Subscription = subscription.Subscription != null ? new BillingSubscription(subscription.Subscription) : null;
         UpcomingInvoice = subscription.UpcomingInvoice != null ?
             new BillingSubscriptionUpcomingInvoice(subscription.UpcomingInvoice) : null;
+        Discount = subscription.Discount != null ? new BillingCustomerDiscount(subscription.Discount) : null;
         StorageName = user.Storage.HasValue ? CoreHelpers.ReadableBytesSize(user.Storage.Value) : null;
         StorageGb = user.Storage.HasValue ? Math.Round(user.Storage.Value / 1073741824D, 2) : 0; // 1 GB
         MaxStorageGb = user.MaxStorageGb;
@@ -41,11 +42,24 @@ public class SubscriptionResponseModel : ResponseModel
     public short? MaxStorageGb { get; set; }
     public BillingSubscriptionUpcomingInvoice UpcomingInvoice { get; set; }
     public BillingSubscription Subscription { get; set; }
+    public BillingCustomerDiscount Discount { get; set; }
     public UserLicense License { get; set; }
     public DateTime? Expiration { get; set; }
     public bool UsingInAppPurchase { get; set; }
 }
 
+public class BillingCustomerDiscount
+{
+    public BillingCustomerDiscount(SubscriptionInfo.BillingCustomerDiscount discount)
+    {
+        Id = discount.Id;
+        Active = discount.Active;
+    }
+
+    public string Id { get; set; }
+    public bool Active { get; set; }
+}
+
 public class BillingSubscription
 {
     public BillingSubscription(SubscriptionInfo.BillingSubscription sub)

src/Core/Models/Business/SubscriptionInfo.cs

@@ -5,10 +5,25 @@ namespace Bit.Core.Models.Business;
 
 public class SubscriptionInfo
 {
+    public BillingCustomerDiscount Discount { get; set; }
     public BillingSubscription Subscription { get; set; }
     public BillingUpcomingInvoice UpcomingInvoice { get; set; }
     public bool UsingInAppPurchase { get; set; }
 
+    public class BillingCustomerDiscount
+    {
+        public BillingCustomerDiscount() { }
+
+        public BillingCustomerDiscount(Discount discount)
+        {
+            Id = discount.Id;
+            Active = discount.Start != null && discount.End == null;
+        }
+
+        public string Id { get; }
+        public bool Active { get; }
+    }
+
     public class BillingSubscription
     {
         public BillingSubscription(Subscription sub)

src/Core/Services/Implementations/StripePaymentService.cs

@@ -1557,11 +1557,20 @@ public class StripePaymentService : IPaymentService
     {
         var subscriptionInfo = new SubscriptionInfo();
 
-        if (subscriber.IsUser() && !string.IsNullOrWhiteSpace(subscriber.GatewayCustomerId))
+        if (!string.IsNullOrWhiteSpace(subscriber.GatewayCustomerId))
         {
             var customer = await _stripeAdapter.CustomerGetAsync(subscriber.GatewayCustomerId);
+
+            if (customer.Discount != null)
+            {
+                subscriptionInfo.Discount = new SubscriptionInfo.BillingCustomerDiscount(customer.Discount);
+            }
+
+            if (subscriber.IsUser())
+            {
                 subscriptionInfo.UsingInAppPurchase = customer.Metadata.ContainsKey("appleReceipt");
             }
+        }
 
         if (!string.IsNullOrWhiteSpace(subscriber.GatewaySubscriptionId))
         {