API: Allow to send activation email when creating customers (#2729)

Co-authored-by: Raphael Michel <michel@rami.io>

src/pretix/base/models/customers.py

@@ -216,6 +216,27 @@ class Customer(LoggedModel):
             testmode=testmode,
         )
 
+    def send_activation_mail(self):
+        from pretix.base.services.mail import mail
+        from pretix.multidomain.urlreverse import build_absolute_uri
+        from pretix.presale.forms.customer import TokenGenerator
+
+        ctx = self.get_email_context()
+        token = TokenGenerator().make_token(self)
+        ctx['url'] = build_absolute_uri(
+            self.organizer,
+            'presale:organizer.customer.activate'
+        ) + '?id=' + self.identifier + '&token=' + token
+        mail(
+            self.email,
+            _('Activate your account at {organizer}').format(organizer=self.organizer.name),
+            self.organizer.settings.mail_text_customer_registration,
+            ctx,
+            locale=self.locale,
+            customer=self,
+            organizer=self.organizer,
+        )
+
 
 class AttendeeProfile(models.Model):
     customer = models.ForeignKey(