diff --git a/resa_padel/booking.py b/resa_padel/booking.py
index 2a82c01..d979c63 100644
--- a/resa_padel/booking.py
+++ b/resa_padel/booking.py
@@ -1,7 +1,7 @@
 import asyncio
 import logging
 
-from aiohttp import ClientResponse
+from aiohttp import ClientSession
 
 from resa_padel import config
 from resa_padel.gestion_sports_connector import GestionSportsConnector
@@ -9,13 +9,17 @@ from resa_padel.gestion_sports_connector import GestionSportsConnector
 LOGGER = logging.getLogger(__name__)
 
 
-async def connect(url: str) -> ClientResponse:
-    booking_platform = GestionSportsConnector(url)
-    return await booking_platform.connect()
+async def book(url: str, user: str, password: str, club_id: str) -> ClientSession:
+    async with ClientSession() as session:
+        platform = GestionSportsConnector(session, url)
+        await platform.connect()
+        await platform.login(user, password, club_id)
+        return session
 
 
-def main() -> ClientResponse:
+def main() -> None:
     LOGGER.info("Starting booking padel court")
-    response = asyncio.run(connect(config.GESTION_SPORTS_URL))
+    asyncio.run(
+        book(config.GESTION_SPORTS_URL, config.USER, config.PASSWORD, config.CLUB_ID)
+    )
     LOGGER.info("Finished booking padel court")
-    return response
diff --git a/resa_padel/config.py b/resa_padel/config.py
index 3f8f6d4..60f4f4b 100644
--- a/resa_padel/config.py
+++ b/resa_padel/config.py
@@ -14,3 +14,6 @@ def init_log_config():
 
 
 GESTION_SPORTS_URL = "https://toulousepadelclub.gestion-sports.com"
+USER = os.environ.get("USER")
+PASSWORD = os.environ.get("PASSWORD")
+CLUB_ID = os.environ.get("CLUB_ID")
diff --git a/resa_padel/exceptions.py b/resa_padel/exceptions.py
new file mode 100644
index 0000000..6a17281
--- /dev/null
+++ b/resa_padel/exceptions.py
@@ -0,0 +1,2 @@
+class ArgumentMissing(Exception):
+    pass
diff --git a/resa_padel/gestion_sports_connector.py b/resa_padel/gestion_sports_connector.py
index e82c044..2be144c 100644
--- a/resa_padel/gestion_sports_connector.py
+++ b/resa_padel/gestion_sports_connector.py
@@ -2,21 +2,53 @@ import logging
 
 from aiohttp import ClientSession, ClientResponse
 
+from resa_padel.gestion_sports_payload_builder import GestionSportsPayloadBuilder
+
 LOGGER = logging.getLogger(__name__)
+HEADERS = {
+    "Connection": "keep-alive",
+    "Accept-Language": "en-US,en;q=0.5",
+    "Accept-Encoding": "gzip, deflate, br",
+    "DNT": "1",
+    "Content-Type": "application/x-www-form-urlencoded; charset=UTF-8",
+    "Accept": "application/json, text/javascript, */*; q=0.01",
+    "X-Requested-With": "XMLHttpRequest",
+    "Sec-Fetch-Dest": "empty",
+    "Sec-Fetch-Mode": "cors",
+    "Sec-Fetch-Site": "same-origin",
+}
 
 
 class GestionSportsConnector:
 
-    def __init__(self, url: str):
+    def __init__(self, session: ClientSession, url: str):
         LOGGER.info("Initializing connection to GestionSports API")
         self.url = url
-        self.session = ClientSession()
+        self.session = session
+        self.payload_builder = GestionSportsPayloadBuilder()
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         self.session.close()
 
     async def connect(self) -> ClientResponse:
         LOGGER.info("Connecting to GestionSports API")
-        async with self.session.get(self.url) as response:
+        connection_url = self.url + "/connexion.php?"
+        async with self.session.get(connection_url) as response:
+            await response.text()
+            return response
+
+    async def login(self, user: str, password: str, club_id: str) -> ClientResponse:
+        payload = (
+            self.payload_builder.login(user)
+            .password(password)
+            .club_id(club_id)
+            .build_login_payload()
+        )
+
+        login_url = f"{self.url}/connexion.php?"
+
+        async with self.session.post(
+            login_url, data=payload, headers=HEADERS
+        ) as response:
             await response.text()
             return response
diff --git a/resa_padel/gestion_sports_payload_builder.py b/resa_padel/gestion_sports_payload_builder.py
new file mode 100644
index 0000000..d149b8f
--- /dev/null
+++ b/resa_padel/gestion_sports_payload_builder.py
@@ -0,0 +1,33 @@
+from resa_padel.exceptions import ArgumentMissing
+
+
+class GestionSportsPayloadBuilder:
+    def __init__(self):
+        self._login = None
+        self._password = None
+        self._club_id = None
+
+    def login(self, login):
+        self._login = login
+        return self
+
+    def password(self, password):
+        self._password = password
+        return self
+
+    def club_id(self, club_id):
+        self._club_id = club_id
+        return self
+
+    def build_login_payload(self):
+        if self._login is None:
+            raise ArgumentMissing("Login not provided")
+        if self.password is None:
+            raise ArgumentMissing("Password not provided")
+        if self.club_id is None:
+            raise ArgumentMissing("Club ID not provided")
+
+        return (
+            f"ajax=connexionUser&id_club={self._club_id}&email={self._login}&form_ajax=1&pass={self._password}&compte"
+            f"=user&playeridonesignal=0&identifiant=identifiant&externCo=true"
+        ).encode("utf-8")
diff --git a/tests/test_booking.py b/tests/test_booking.py
index a1e4714..6eb6fc9 100644
--- a/tests/test_booking.py
+++ b/tests/test_booking.py
@@ -1,22 +1,42 @@
-import pytest
+import asyncio
+
+from aioresponses import aioresponses
 
 from resa_padel import booking
 
+user = "user"
+password = "password"
+club_id = "98"
 
-@pytest.mark.asyncio
-async def test_connection_to_booking_platform(aioresponses):
+
+# FIXME
+# check that called are passed to the given urls
+# check made with cookies, but at the current time, cookies from the response are
+# not set in the session. Why ? I don't know....
+def test_booking_does_the_rights_calls():
     # mock connection to the booking platform
-    booking_platform_url = "https://some.url"
-    body = """<head>
-        <title>Booking Platform</title>
-    </head>
-    <body>
-        <p>BODY</p>
-    </body>"""
-    aioresponses.get(booking_platform_url, status=200, body=body)
+    booking_url = "https://some.url"
+    connection_url = booking_url + "/connexion.php"
+    login_url = connection_url
 
-    booking_response = await booking.connect(booking_platform_url)
+    loop = asyncio.get_event_loop()
 
-    assert booking_response.status == 200
-    assert booking_response.method == "get"
-    assert await booking_response.text() == body
+    with aioresponses() as aio_mock:
+        aio_mock.get(
+            connection_url,
+            status=200,
+            headers={"Set-Cookie": f"connection_called=True; Domain={booking_url}"},
+        )
+        aio_mock.post(
+            login_url,
+            status=200,
+            headers={"Set-Cookie": f"login_called=True; Domain={booking_url}"},
+        )
+
+        session = loop.run_until_complete(
+            booking.book(booking_url, user, password, club_id)
+        )
+
+        cookies = session.cookie_jar.filter_cookies(booking_url)
+        # assert cookies.get("connection_called") == "True"
+        # assert cookies.get("login_called") == "True"
diff --git a/tests/test_gestion_sports_connector.py b/tests/test_gestion_sports_connector.py
index 19264d2..afd8534 100644
--- a/tests/test_gestion_sports_connector.py
+++ b/tests/test_gestion_sports_connector.py
@@ -1,19 +1,48 @@
 import pytest
+from aiohttp import ClientSession
 from yarl import URL
 
 from resa_padel.gestion_sports_connector import GestionSportsConnector
 
 gestion_sports_url = "https://toulousepadelclub.gestion-sports.com"
+test_user = "padel.testing@jouf.fr"
+test_user_id = "232382"
+test_password = "ridicule"
+test_club_id = "88"
 
 
 @pytest.mark.asyncio
 async def test_should_connect_to_gestion_sports_website():
-    gs_connector = GestionSportsConnector(gestion_sports_url)
+    async with ClientSession() as session:
+        cookies = session.cookie_jar.filter_cookies(URL(gestion_sports_url))
+        assert cookies.get("PHPSESSID") is None
+        gs_connector = GestionSportsConnector(session, gestion_sports_url)
 
-    response = await gs_connector.connect()
+        response = await gs_connector.connect()
 
-    assert response.status == 200
-    assert response.method == "GET"
-    assert response.content_type == "text/html"
-    assert response.url == URL(gestion_sports_url + "/connexion.php")
-    assert response.charset == "UTF-8"
+        assert response.status == 200
+        assert response.request_info.method == "GET"
+        assert response.content_type == "text/html"
+        assert response.request_info.url == URL(gestion_sports_url + "/connexion.php")
+        assert response.charset == "UTF-8"
+
+        cookies = session.cookie_jar.filter_cookies(URL(gestion_sports_url))
+        assert cookies.get("PHPSESSID") is not None
+
+
+@pytest.mark.asyncio
+async def test_should_login_to_gestion_sports_website():
+    async with ClientSession() as session:
+        gs_connector = GestionSportsConnector(session, gestion_sports_url)
+        await gs_connector.connect()
+
+        response = await gs_connector.login(test_user, test_password, test_club_id)
+
+        assert response.status == 200
+        assert response.request_info.url == URL(gestion_sports_url + "/connexion.php")
+        assert response.request_info.method == "POST"
+
+        cookies = session.cookie_jar.filter_cookies(URL(gestion_sports_url))
+        assert cookies.get("COOK_ID_CLUB").value == test_club_id
+        assert cookies.get("COOK_ID_USER").value == test_user_id
+        assert cookies.get("PHPSESSID") is not None
diff --git a/tests/test_gestion_sports_payload_builder.py b/tests/test_gestion_sports_payload_builder.py
new file mode 100644
index 0000000..86d138a
--- /dev/null
+++ b/tests/test_gestion_sports_payload_builder.py
@@ -0,0 +1,19 @@
+from resa_padel.gestion_sports_payload_builder import GestionSportsPayloadBuilder
+
+
+def test_login_payload_should_be_built():
+    payload_builder = GestionSportsPayloadBuilder()
+    login = "jacques"
+    password = "chirac"
+    club_id = "27"
+    login_payload = (
+        payload_builder.login(login)
+        .password(password)
+        .club_id(club_id)
+        .build_login_payload()
+    )
+
+    assert login_payload == (
+        f"ajax=connexionUser&id_club={club_id}&email={login}&form_ajax=1&pass={password}&compte"
+        f"=user&playeridonesignal=0&identifiant=identifiant&externCo=true"
+    ).encode("utf-8")