add refund_payment to client

Author: helgaeythors

askell/client.py

@@ -121,6 +121,10 @@ def import_payment_method(self, user, payment_method_data):
         response = requests.post(self._build_url(path), headers=self._auth, json=data)
 
         return response.json()
-
+    
+    def refund_payment(self, uuid):
+        path = '/payments/{}/refund/'.format(uuid)
+        response = requests.post(self._build_url(path), headers=self._auth, json={})
+        return response.json()
 
 client = AskellClient(ASKELL_SECRET_KEY, endpoint=ASKELL_ENDPOINT)