Index: stamper/stamper.py
===================================================================
--- stamper/stamper.py	(revision 53)
+++ stamper/stamper.py	(revision 54)
@@ -436,5 +436,7 @@
         print('[warning] remember to review the resulting stamps file')
 
-    def push_stamps(self, customer=None, filter_from=None, filter_to=None):
+    def push_stamps(self, customer=None, stamp_filter=None):
+        filter_from, filter_to = self.validate_filter(stamp_filter)
+
         stamps = []
         for stamp in self.stamps:
@@ -454,4 +456,5 @@
                     continue
                 stamps.append(stamp)
+
         stamps = json.dumps(stamps, indent=4)
         http_client = HTTPClient(REMOTE_BASE_URL)