Let purchased items contain SKUs

aleksis/apps/paweljong/models.py

@@ -313,7 +313,7 @@ class EventRegistration(ExtensibleModel):
             quantity=1,
             price=Decimal(self.event.cost / 1.07),
             currency="EUR",
-            sku="",
+            sku="EVENT",
             tax_rate=7,
         )
 
@@ -324,7 +324,7 @@ class EventRegistration(ExtensibleModel):
                 quantity=1,
                 price=self.donation,
                 currency="EUR",
-                sku="",
+                sku="DONAT",
                 tax_rate=0,
             )
 
@@ -335,7 +335,7 @@ class EventRegistration(ExtensibleModel):
                 quantity=1,
                 price=-1 * self.voucher.discount * (self.event.cost / 1.07) / 100,
                 currency="EUR",
-                sku="",
+                sku="DISCO",
                 tax_rate=7,
             )