Payment provider API: Add confirm_button_name

doc/development/api/payment.rst

@@ -62,6 +62,8 @@ The provider class
 
    .. autoattribute:: public_name
 
+   .. autoattribute:: confirm_button_name
+
    .. autoattribute:: is_enabled
 
    .. autoattribute:: priority

src/pretix/base/payment.py

@@ -191,6 +191,15 @@ class BasePaymentProvider:
         """
         return self.verbose_name
 
+    @property
+    def confirm_button_name(self) -> str:
+        """
+        A label for the "confirm" button on the last page before a payment is started. This
+        is **not** used in the regular checkout flow, but only if the payment method is selected
+        for an existing order later on.
+        """
+        return _("Pay now")
+
     @property
     def identifier(self) -> str:
         """

src/pretix/presale/templates/pretixpresale/event/order_pay_confirm.html

@@ -42,7 +42,7 @@
             </div>
             <div class="col-md-4 col-md-offset-4">
                 <button class="btn btn-block btn-primary btn-lg" type="submit">
-                    {% trans "Pay now" %}
+                    {{ payment_provider.confirm_button_name }}
                 </button>
             </div>
             <div class="clearfix"></div>