[PM-30108] import discount from stripe (#6982)

* [PM-30108] import discount from stripe

* fix repo tests

* pr feedback

* wrap discounts in feature flag

* claude pr feedback

src/Core/Billing/Constants/StripeConstants.cs

@@ -39,6 +39,11 @@ public static class StripeConstants
         }
     }
 
+    public static class CouponExpandablePropertyNames
+    {
+        public const string AppliesTo = "applies_to";
+    }
+
     public static class ErrorCodes
     {
         public const string CustomerTaxLocationInvalid = "customer_tax_location_invalid";

src/Core/Billing/Enums/DiscountAudienceType.cs

@@ -6,8 +6,14 @@
 /// </summary>
 public enum DiscountAudienceType
 {
+    /// <summary>
+    /// Discount applies to all users regardless of subscription history.
+    /// This is the default value (0) when audience restrictions are not applied.
+    /// </summary>
+    AllUsers = 0,
+
     /// <summary>
     /// Discount applies to users who have never had a subscription before.
     /// </summary>
-    UserHasNoPreviousSubscriptions = 0
+    UserHasNoPreviousSubscriptions = 1
 }

src/Core/Billing/Services/IStripeAdapter.cs

@@ -48,4 +48,6 @@ public interface IStripeAdapter
     Task CancelSetupIntentAsync(string id, SetupIntentCancelOptions options = null);
     Task<SetupIntent> GetSetupIntentAsync(string id, SetupIntentGetOptions options = null);
     Task<Price> GetPriceAsync(string id, PriceGetOptions options = null);
+    Task<Coupon> GetCouponAsync(string couponId, CouponGetOptions options = null);
+    Task<List<Product>> ListProductsAsync(ProductListOptions options = null);
 }

src/Core/Billing/Services/Implementations/StripeAdapter.cs

@@ -27,6 +27,8 @@ public class StripeAdapter : IStripeAdapter
     private readonly TestClockService _testClockService;
     private readonly CustomerBalanceTransactionService _customerBalanceTransactionService;
     private readonly RegistrationService _taxRegistrationService;
+    private readonly CouponService _couponService;
+    private readonly ProductService _productService;
 
     public StripeAdapter()
     {
@@ -44,6 +46,8 @@ public class StripeAdapter : IStripeAdapter
         _testClockService = new TestClockService();
         _customerBalanceTransactionService = new CustomerBalanceTransactionService();
         _taxRegistrationService = new RegistrationService();
+        _couponService = new CouponService();
+        _productService = new ProductService();
     }
 
     /**************
@@ -209,4 +213,16 @@ public class StripeAdapter : IStripeAdapter
 
     public Task<Card> DeleteCardAsync(string customerId, string cardId, CardDeleteOptions options = null) =>
         _cardService.DeleteAsync(customerId, cardId, options);
+
+    /************
+     ** COUPON **
+     ************/
+    public Task<Coupon> GetCouponAsync(string couponId, CouponGetOptions options = null) =>
+        _couponService.GetAsync(couponId, options);
+
+    /*************
+     ** PRODUCT **
+     *************/
+    public async Task<List<Product>> ListProductsAsync(ProductListOptions options = null) =>
+        (await _productService.ListAsync(options)).Data;
 }

src/Core/Billing/Subscriptions/Repositories/ISubscriptionDiscountRepository.cs

@@ -20,4 +20,13 @@ public interface ISubscriptionDiscountRepository : IRepository<SubscriptionDisco
     /// <param name="stripeCouponId">The Stripe coupon ID to search for.</param>
     /// <returns>The subscription discount if found; otherwise, null.</returns>
     Task<SubscriptionDiscount?> GetByStripeCouponIdAsync(string stripeCouponId);
+
+    /// <summary>
+    /// Lists subscription discounts with pagination support.
+    /// Returns discounts ordered by creation date descending (newest first).
+    /// </summary>
+    /// <param name="skip">Number of records to skip (for pagination).</param>
+    /// <param name="take">Number of records to take (page size).</param>
+    /// <returns>A collection of subscription discounts for the requested page.</returns>
+    Task<ICollection<SubscriptionDiscount>> ListAsync(int skip, int take);
 }

src/Core/Constants.cs

@@ -189,6 +189,7 @@ public static class FeatureFlagKeys
     public const string PM28265_EnableReconcileAdditionalStorageJob = "pm-28265-enable-reconcile-additional-storage-job";
     public const string PM28265_ReconcileAdditionalStorageJobEnableLiveMode = "pm-28265-reconcile-additional-storage-job-enable-live-mode";
     public const string PM29594_UpdateIndividualSubscriptionPage = "pm-29594-update-individual-subscription-page";
+    public const string PM29108_EnablePersonalDiscounts = "pm-29108-enable-personal-discounts";
 
     /* Key Management Team */
     public const string PrivateKeyRegeneration = "pm-12241-private-key-regeneration";