Fixed handling of token in card update view

Refs #1912

Author: bmispelon

fundraising/views.py

@@ -159,8 +159,9 @@ def update_card(request):
         customer = stripe.Customer.retrieve(
             donation.stripe_customer_id, expand=["subscriptions"]
         )
+        token = stripe.Token.retrieve(request.POST["stripe_token"])
         subscription = customer.subscriptions.retrieve(donation.stripe_subscription_id)
-        subscription.default_source = request.POST["stripe_token"]
+        subscription.default_source = token.card.id
         subscription.save()
     except stripe.error.StripeError as e:
         data = {"success": False, "error": str(e)}