Made cp_key in test client a string

Author: MarkusH

tests/test_client.py

@@ -74,7 +74,7 @@ class TestLaterPayClient(unittest.TestCase):
 
     def setUp(self):
         self.lp = LaterPayClient(
-            1,
+            '1',
             'some-secret')
         self.item = ItemDefinition(1, 'EUR20', 'http://example.com/', 'title')
 
@@ -369,7 +369,7 @@ def test_get_access_params(self, time_time_mock, sign_mock):
         params = self.lp.get_access_params('article-1', lptoken='fake-lptoken')
 
         self.assertEqual(params, {
-            'cp': 1,
+            'cp': '1',
             'ts': '123',
             'lptoken': 'fake-lptoken',
             'article_id': ['article-1'],