fix Promotion code (dj-stripe#2083)

* rm created prpoerty as it clashed with created field

* add promotion code to model namespace

* add promotion code admin

djstripe/admin/admin.py

@@ -501,6 +501,13 @@ def get_queryset(self, request):
         return super().get_queryset(request).prefetch_related("prices")
 
 
+@admin.register(models.PromotionCode)
+class PromotionCodeAdmin(StripeModelAdmin):
+    list_display = ("code", "active", "created", "times_redeemed", "max_redemptions")
+    search_fields = ("code",)
+    list_filter = ("active", "created")
+
+
 @admin.register(models.Refund)
 class RefundAdmin(StripeModelAdmin):
     list_display = (

djstripe/models/__init__.py

@@ -8,6 +8,7 @@
     InvoiceItem,
     LineItem,
     Plan,
+    PromotionCode,
     ShippingRate,
     Subscription,
     SubscriptionItem,
@@ -72,6 +73,7 @@
     "Plan",
     "Price",
     "Product",
+    "PromotionCode",
     "Refund",
     "ShippingRate",
     "ScheduledQueryRun",

djstripe/models/billing.py

@@ -227,11 +227,6 @@ def code(self) -> str:
     def active(self) -> str:
         return self.stripe_data["active"]
 
-    # https://docs.stripe.com/api/promotion_codes/object#promotion_code_object-created
-    @property
-    def created(self):
-        return self.stripe_data["created"]
-
     # https://docs.stripe.com/api/promotion_codes/object#promotion_code_object-times_redeemed
     @property
     def times_redeemed(self) -> int: