diff --git a/easy_my_coop_online_payment/models/coop.py b/easy_my_coop_online_payment/models/coop.py
index e0ab4de..3ff0ee9 100644
--- a/easy_my_coop_online_payment/models/coop.py
+++ b/easy_my_coop_online_payment/models/coop.py
@@ -16,7 +16,7 @@ class AccountInvoice(models.Model):
     _inherit = 'account.invoice'
         
     def post_process_confirm_paid(self, effective_date):
-        if self.payment_type == 'deferred':
+        if self.subscription_request.payment_type == 'deferred':
             self.set_cooperator_effective(effective_date) 
                
         return True
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