diff --git a/src/_secureaccesstokenauthorizer/controller.py b/src/_secureaccesstokenauthorizer/controller.py
index 568ed9cf867bba4e7a092dd446199d2573a06a8c..5b3bea2b4492ac9c0578e0c474cdc6b93c6279c0 100644
--- a/src/_secureaccesstokenauthorizer/controller.py
+++ b/src/_secureaccesstokenauthorizer/controller.py
@@ -24,7 +24,4 @@ class PaymentController(object):
     store = attr.ib()
 
     def redeem(self, prn):
-        try:
-            self.store.get(prn)
-        except KeyError:
-            self.store.add(prn)
+        self.store.add(prn)