minor fix refresh token

view/sale_web_channel_form.xml

@@ -64,6 +64,9 @@ The COPYRIGHT file at the top level of this repository contains the full copyrig
                 icon="tryton-ok"/>
             <button name="finished" string="Finished"
                 icon="tryton-forward"/>
+            <button name="refresh_token" string="Finished"
+                icon="tryton-ok"/>
+
         </group>
     </group>
 </form>

web_channel.py

@@ -144,6 +144,9 @@ class SaleWebChannel(Workflow, ModelSQL, ModelView):
             'finished': {
                 'invisible': Eval('state') != 'active',
             },
+            'refresh_token': {
+                'invisible': Eval('channel_name') != 'shopify',
+            },
         })
 
     @staticmethod
@@ -176,6 +179,19 @@ class SaleWebChannel(Workflow, ModelSQL, ModelView):
     def finished(cls, records):
         pass
 
+    @classmethod
+    @ModelView.button
+    def refresh_token(cls, records):
+        if records:
+            for record in records:
+                if record.channel_name == 'mercadolibre':
+                    MercadoLibre = Pool().get('sale.web_channel.mercado_libre')
+                    channels = MercadoLibre.search([
+                        ('state', '=', 'active'),
+                        ('channel_name', '=', 'mercadolibre'),
+                        ])
+                    channels[0]._validate_token()
+
     def send_mail_notification(self, message):
         Template = Pool().get('email.template')
         setattr(self, 'message', message)