diff --git a/.python-version b/.python-version
deleted file mode 100644
index c1e43e6..0000000
--- a/.python-version
+++ /dev/null
@@ -1 +0,0 @@
-3.7.3
diff --git a/retailcrm/versions/v5.py b/retailcrm/versions/v5.py
index 1749436..e7d7f47 100644
--- a/retailcrm/versions/v5.py
+++ b/retailcrm/versions/v5.py
@@ -476,7 +476,7 @@ class Client(Base):
 
         return self.post('/orders/payments/' + str(uid) + '/delete')
 
-    def order_payment_edit(self, payment, uid_type='externalId', site=None):
+    def order_payment_edit(self, payment, uid_type='id', site=None):
         """
         :param payment: object
         :param uid_type: string
@@ -484,13 +484,10 @@ class Client(Base):
         :return: Response
         """
         self.parameters['payment'] = json.dumps(payment)
-
+        self.parameters['by'] = uid_type
         if site is not None:
             self.parameters['site'] = site
 
-        if uid_type != 'externalId':
-            self.parameters['by'] = uid_type
-
         return self.post('/orders/payments/' + str(payment[uid_type]) + '/edit')
 
     def orders_statuses(self, ids, external_ids):
diff --git a/setup.py b/setup.py
index 6d42008..43fc55f 100644
--- a/setup.py
+++ b/setup.py
@@ -37,6 +37,7 @@ setup(
         'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
+        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3 :: Only',
         'Topic :: Software Development :: Libraries :: Python Modules',
     ]
diff --git a/tests/v5_tests.py b/tests/v5_tests.py
index 03eef87..4badebf 100644
--- a/tests/v5_tests.py
+++ b/tests/v5_tests.py
@@ -7,6 +7,7 @@ retailCRM API client v5 tests
 
 import unittest
 import os
+import random
 import retailcrm
 
 
@@ -72,3 +73,43 @@ class TestVersion5(unittest.TestCase):
 
         self.assertTrue(response.is_successful(), True)
         self.assertTrue(response.get_status_code() < 400, True)
+
+    def test_check_order_payment(self):
+        rand = random.randint(10000, 99999)
+        ex_id = 'test-case-payment' + str(rand)
+        order = {
+            'firstName': 'John',
+            'lastName': 'Doe',
+            'phone': '+79000000000',
+            'email': 'john@example.com',
+            'orderMethod': 'call-request',
+            'delivery': {
+                'code': 'self-delivery'
+            },
+            'payments': [
+                {
+                    'externalId': ex_id,
+                    'amount': 100,
+                    'type': 'cash'
+                }
+            ]
+        }
+
+        response = self.client.order_create(order)
+
+        response_data = response.get_response()
+        payment_id = response_data['order']['payments'][0]['id']
+        print(payment_id)
+
+        self.assertTrue(response.is_successful(), True)
+        self.assertTrue(response.get_status_code() < 400, True)
+
+        payment_response = self.client.order_payment_edit({'externalId': ex_id, 'status': 'invoice'}, 'externalId')
+
+        self.assertTrue(payment_response.is_successful(), True)
+        self.assertTrue(payment_response.get_status_code() < 400, True)
+
+        payment_response = self.client.order_payment_edit({'id': payment_id, 'status': 'paid'})
+
+        self.assertTrue(payment_response.is_successful(), True)
+        self.assertTrue(payment_response.get_status_code() < 400, True)