Added refunded state and refund transition to transactions

gateway.py

@@ -82,6 +82,7 @@ class AccountPaymentGatewayTransaction(Workflow, ModelSQL, ModelView):
         ('authorized', 'Authorized'),
         ('done', 'Done'),
         ('cancel', 'Canceled'),
+        ('refunded', 'Refunded'),
         ], 'State', readonly=True)
     log = fields.Text("Log", depends=['state'], states=READONLY_IF_NOT_DRAFT)
 
@@ -108,7 +109,9 @@ class AccountPaymentGatewayTransaction(Workflow, ModelSQL, ModelView):
                 ('pending', 'done'),
                 ('authorized', 'cancel'),
                 ('authorized', 'done'),
+                ('authorized', 'refunded'),
                 ('done', 'cancel'),
+                ('done', 'refunded'),
                 ))
         cls._buttons.update({
                 'cancel': {
@@ -130,6 +133,11 @@ class AccountPaymentGatewayTransaction(Workflow, ModelSQL, ModelView):
                         'draft', 'pending', 'authorized',
                         ]),
                     },
+                'refund': {
+                    'invisible': ~Eval('state').in_([
+                        'authorized', 'done',
+                        ]),
+                    },
                 })
 
     @staticmethod
@@ -245,3 +253,13 @@ class AccountPaymentGatewayTransaction(Workflow, ModelSQL, ModelView):
             if hasattr(transaction, method_name):
                 getattr(transaction, method_name)()
         pass
+
+    @classmethod
+    @ModelView.button
+    @Workflow.transition('refunded')
+    def refund(cls, transactions):
+        for transaction in transactions:
+            method_name = 'refund_%s' % transaction.gateway.method
+            if hasattr(transaction, method_name):
+                getattr(transaction, method_name)()
+        pass

view/transaction_form.xml

@@ -42,6 +42,8 @@ this repository contains the full copyright notices and license terms. -->
             icon="tryton-go-next"/>
         <button name="authorized" string="Authorized"
             icon="tryton-go-next"/>
+        <button name="refund" string="Refund"
+            icon="tryton-go-previous"/>
         <button name="confirm" string="Confirm"
             icon="tryton-go-next"/>
     </group>