diff --git a/book_crossfit.py b/book_crossfit.py
index d913829..3746858 100755
--- a/book_crossfit.py
+++ b/book_crossfit.py
@@ -216,32 +216,58 @@ class CrossFitBooker:
             return None
 
     def book_session(self, session_id: str) -> bool:
-        """Book a specific session"""
+        """Book a specific session with debug logging."""
+        print(f"\n[INFO] Attempting to book session_id: {session_id}")
         if not self.auth_token or not self.user_id:
-            print("Not authenticated")
+            print("[ERROR] Not authenticated (missing auth_token or user_id)")
             return False
 
         try:
-            # Prepare request with mandatory parameters
+            # Prepare headers
+            headers = self.get_auth_headers()
+
+            # print(f"[DEBUG] Request headers: {headers}")
+
+            # Prepare the exact request data from cURL
             request_data = self.mandatory_params.copy()
             request_data.update({
+                "id_activity_calendar": session_id,  # Note the different parameter name
                 "id_user": self.user_id,
-                "id_activity": session_id
+                "action_by": self.user_id,  # Same as id_user in this case
+                "n_guests": "0",
+                "booked_on": "3"  # 3 likely means "booked via app"
             })
 
+            print(f"[DEBUG] Final request data: {request_data}")
+
+            # Use the correct endpoint
             response = self.session.post(
-                "https://sport.nubapp.com/api/v4/activities/bookActivity.php",
-                headers=self.get_auth_headers(),
-                data=urlencode(request_data))
+                "https://sport.nubapp.com/api/v4/activities/bookActivityCalendar.php",
+                headers=headers,
+                data=urlencode(request_data)
+            )
+
+            print(f"[DEBUG] Response status: {response.status_code}")
+            print(f"[DEBUG] Response text: {response.text}")
 
             if response.ok:
-                print(f"Successfully booked session {session_id}")
-                return True
+                try:
+                    json_response = response.json()
+                    if json_response.get("success", False):
+                        print(f"[SUCCESS] Booked session {session_id}")
+                        return True
+                    else:
+                        print(f"[ERROR] API returned success:false: {json_response}")
+                        return False
+                except ValueError:
+                    print("[ERROR] Invalid JSON response")
+                    return False
             else:
-                print(f"Error booking session {session_id}: {response.status_code} - {response.text}")
+                print(f"[ERROR] HTTP {response.status_code}: {response.text}")
                 return False
+
         except Exception as e:
-            print(f"Error booking session: {str(e)}")
+            print(f"[CRITICAL] Unexpected error: {str(e)}", exc_info=True)
             return False
 
     def is_session_bookable(self, session: Dict, current_time: datetime) -> bool:
@@ -397,7 +423,9 @@ if __name__ == "__main__":
 
 
     for session in bookable_sessions:
-        result = booker.matches_preferred_session(session, current_time)
-        print(session.get("name_activity") + " / " + str(result))
+        is_prefered_session = booker.matches_preferred_session(session, current_time)
+        # print(session.get("name_activity") + " / " + str(is_prefered_session))
+        if is_prefered_session:
+            booker.book_session(session.get("id_activity_calendar"))
         
 
diff --git a/crossfit.txt b/crossfit.txt
index b6fb432..83703b8 100644
--- a/crossfit.txt
+++ b/crossfit.txt
@@ -77,4 +77,24 @@ Book activity
   -H 'Sec-Fetch-Site: cross-site' \
   -H 'Priority: u=0' \
   -H 'TE: trailers' \
-  --data-raw 'app_version=5.09.21&id_application=81560887^&id_activity_calendar=19291336&id_user=3191429&action_by=3191429&n_guests=0&booked_on=3'
\ No newline at end of file
+  --data-raw 'app_version=5.09.21&id_application=81560887^&id_activity_calendar=19291336&id_user=3191429&action_by=3191429&n_guests=0&booked_on=3'
+
+  curl 'https://sport.nubapp.com/api/v4/activities/bookActivityCalendar.php' \
+  -X POST \
+  -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0' \
+  -H 'Accept: application/json, text/plain, */*' \
+  -H 'Accept-Language: en-GB,en;q=0.8,fr-FR;q=0.5,fr;q=0.3' \
+  -H 'Accept-Encoding: gzip, deflate, br, zstd' \
+  -H 'Referer: https://box.resawod.com/' \
+  -H 'Content-Type: application/x-www-form-urlencoded' \
+  -H 'Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJpYXQiOjE3NTI4MjQ5NjcsImV4cCI6MTc2ODcyNjE2Nywicm9sZXMiOlsiUk9MRV9VU0VSIl0sImlkX3VzZXIiOjMxOTE0MjksImlkX2FwcGxpY2F0aW9uIjo4MTU2MDg4NywicGFzc3dvcmRfaGFzaCI6ImEzZGZiOGQzY2NhNTA5NmJhYzYxMWM4MmEwMzYyYTg2ODc3MjQ4MjIiLCJhdXRoZW50aWNhdGlvbl90eXBlIjoiYXBpIiwidXNlcm5hbWUiOiJLZXZpbjg0MDcifQ.OMw1ziZHctxqeBYXyMag-XPnok5Ec4QoVyPrmiUIH6HsEl1WLvpsC-FfkYrQ4dvRqy2MO7ZOOoUf8CL1D2GpcaGke3nYDmQ8d7FDn_veL0vRYhZ6-AGJfDJ4O5pc_ZjjspF8CkpKEHvZLeQfIHzvbU79mjDzXsIjZzD00pBBt4sECrPaHArPvQI77ES7r_q5spitHTUy3Jeeir5bax3gMWUu6ru5dWciG0L3_tTMauTUVw68eS-nxWH4oxYPkfkt8UrQ3Xqh3Ezm3I06zD174iy0fY20XCx34SvjaP3rU3rELApDKZaWYrpBjSdBgXAz27TPfP4ZajnArjQzkjTgDw' \
+  -H 'Nubapp-Origin: user_apps' \
+  -H 'Origin: https://box.resawod.com' \
+  -H 'Sec-GPC: 1' \
+  -H 'Connection: keep-alive' \
+  -H 'Sec-Fetch-Dest: empty' \
+  -H 'Sec-Fetch-Mode: cors' \
+  -H 'Sec-Fetch-Site: cross-site' \
+  -H 'Priority: u=0' \
+  -H 'TE: trailers' \
+  --data-raw 'app_version=5.09.21&id_application=81560887&id_activity_calendar=19291321&id_user=3191429&action_by=3191429&n_guests=0&booked_on=3'
\ No newline at end of file