diff --git a/mangopay/api.py b/mangopay/api.py
index 3e552697..d1a2f629 100644
--- a/mangopay/api.py
+++ b/mangopay/api.py
@@ -31,9 +31,9 @@
 
 logger = logging.getLogger('mangopay')
 
-requests_session = requests.Session()
 rate_limits = None
 
+
 class APIRequest(object):
 
 
@@ -51,6 +51,7 @@ def __init__(self, client_id=None, apikey=None, api_url=None, api_sandbox_url=No
         self.auth_manager = AuthorizationTokenManager(self, storage_strategy)
         self.timeout = timeout
         self.proxies = proxies
+        self.requests_session = requests.Session()
 
     def set_rate_limit(self, rate_limit):
         global rate_limits
@@ -111,11 +112,11 @@ def custom_request(self, method, url, data=None, idempotency_key=None, oauth_req
         request_started.send(url=url, data=truncated_data, headers=headers, method=method)
 
         try:
-            result = requests_session.request(method, url,
-                                              data=data,
-                                              headers=headers,
-                                              timeout=self.timeout,
-                                              proxies=self.proxies)
+            result = self.requests_session.request(method, url,
+                                                   data=data,
+                                                   headers=headers,
+                                                   timeout=self.timeout,
+                                                   proxies=self.proxies)
         except ConnectionError as e:
             msg = '{}'.format(e)