Stripe: Allow destination charges

src/pretix/plugins/stripe/payment.py

@@ -290,6 +290,14 @@ class StripeSettingsHolder(BasePaymentProvider):
                  )),
             ] + list(super().settings_form_fields.items()) + moto_settings
         )
+        if not self.settings.connect_client_id or self.settings.secret_key:
+            d['connect_destination'] = forms.CharField(
+                label=_('Destination'),
+                validators=(
+                    StripeKeyValidator(['acct_']),
+                ),
+                required=False
+            )
         d.move_to_end('_enabled', last=False)
         return d