Add extra param for non credit cards (#2)

* Add extra param for non credit cards

* Don't remove expirity fields when non-credit cards are used

* Update version

datatrans/__init__.py

@@ -1,4 +1,4 @@
-__version__ = '1.0.8'
+__version__ = '1.0.9'
 __copyright__ = 'Copyright (c) 2017, skioo SA'
 __licence__ = 'MIT'
 __URL__ = 'https://github.com/skioo/django-datatrans-gateway'

datatrans/gateway/payment_with_alias.py

@@ -71,6 +71,12 @@ def build_pay_with_alias_request_xml(amount: Money, client_ref: str, alias_regis
     SubElement(request, 'reqtype').text = 'CAA'
     SubElement(request, 'sign').text = sign_mpo(merchant_id, amount, currency, client_ref)
 
+    # For non credit card payment methods who support the creation of an alias
+    # the <pmethod> attribute needs to be submitted
+    # https://api-reference.datatrans.ch/xml/#authorization-with-an-existing-alias
+    if alias_registration.payment_method in ('REK',):
+        SubElement(request, 'pmethod').text = alias_registration.payment_method
+
     return tostring(root, encoding='utf8')