diff --git a/app.py b/app.py
index 6a0f4c1..1623c19 100644
--- a/app.py
+++ b/app.py
@@ -1,7 +1,10 @@
+import logging
+
 from flask import Flask
 
-from dto.requests import GameStartRequestDTO
-from services.julius_baer_api_client import JuliusBaerApiClient
+import config
+from dto.requests import GameStartRequestDTO, GameDecisionRequestDTO
+from services.player import Player
 
 app = Flask(__name__)
 
@@ -12,9 +15,14 @@ def hello_world():  # put application's code here
 
 
 if __name__ == '__main__':
-    jb_client = JuliusBaerApiClient()
-    game_start_request = GameStartRequestDTO(player_name="Welch")
-    res = jb_client.start_game(game_start_request)
-    print(res)
+
+    player = Player()
+    player.play_on_separate_thread()
 
     app.run()
+
+    # res.session_id
+    # UUID('fde19363-a3d5-432e-8b87-54a6dd54f0dd')
+    # second test UUID('e3d58302-400a-4bc6-9772-ae50de43c9f4')
+    # UUID('f8b2a0a6-d4e0-45e6-900f-8ecb3c28f993')
+    # UUID('f8b2a0a6-d4e0-45e6-900f-8ecb3c28f993')
\ No newline at end of file
diff --git a/dto/client_data.py b/dto/client_data.py
deleted file mode 100644
index e47274f..0000000
--- a/dto/client_data.py
+++ /dev/null
@@ -1,10 +0,0 @@
-from pydantic import BaseModel
-
-class ClientData(BaseModel):
-    """
-    Model for the client data attributes which need to be validated and compared for correspondence between
-    the data sources ()
-    """
-    name: str
-
-    # TODO CONTINUE
\ No newline at end of file
diff --git a/services/julius_baer_api_client.py b/services/julius_baer_api_client.py
index b19db6e..d8b5f0d 100644
--- a/services/julius_baer_api_client.py
+++ b/services/julius_baer_api_client.py
@@ -1,7 +1,6 @@
 import requests
 import config
 import logging
-from typing import Dict, Any
 from dto.requests import GameStartRequestDTO, GameDecisionRequestDTO
 from dto.responses import GameStartResponseDTO, GameDecisionResponseDTO
 
@@ -14,8 +13,6 @@ class JuliusBaerApiClient:
     """
 
     def __init__(self):
-        self.client_id = None
-        self.session_id = None
         self.api_uri = config.API_URI
         self.api_key = config.API_KEY
         self.api_team = config.API_TEAM
@@ -33,63 +30,40 @@ class JuliusBaerApiClient:
         Start a new game session.
         """
         logging.info("[+] Starting new game session")
-        start_url = f"{self.api_uri}/game/start"
-        payload = game_start_request.model_dump()  # Convert GameStartRequestDTO to dict for JSON
+        start_uri = f"{self.api_uri}/game/start"
+        payload = game_start_request.model_dump_json()
 
         try:
-            response = requests.post(start_url, json=payload, headers=self.headers)
-            response.raise_for_status()  # Raise exception for HTTP errors
+            response = requests.post(start_uri, data=payload, headers=self.headers)
+            response.raise_for_status()
 
-            response_data = response.json()
-            validated_response = GameStartResponseDTO.model_validate(response_data)
+            response_json = response.json()
+            validated_response = GameStartResponseDTO.model_validate(response_json)
             logging.info(f"Game started successfully. Session: {validated_response.session_id}, Client: {validated_response.client_id}")
 
-
-            # Store session_id and client_id for future calls
-            self.session_id = validated_response.session_id
-            self.client_id = validated_response.client_id
-
             return validated_response
-
         except Exception as e:
             logging.error(f"[!] Failed to start game session: {e}")
             raise
 
-    def make_decision(self, game_decision_request: GameDecisionRequestDTO) -> GameDecisionResponseDTO:
+    def send_decision(self, game_decision_request: GameDecisionRequestDTO) -> GameDecisionResponseDTO:
         """
         Make a game decision (Accept or Reject).
-
-        Args:
-            decision: Either "Accept" or "Reject".
-            session_id: Unique session ID for the game. If None, uses the stored session_id.
-            client_id: Unique client ID for the game. If None, uses the stored client_id.
-
-        Returns:
-            Dict containing the game decision response with status, score, etc.
-
-        Raises:
-            ValueError: If decision is not "Accept" or "Reject".
-            ValueError: If session_id and client_id are not provided or stored from a previous start_game call.
         """
-        if game_decision_request.decision not in ["Accept", "Reject"]:
-            raise ValueError('Decision must be either "Accept" or "Reject"')
+        logging.info("[+] Sending decision")
+        decision_uri = f"{self.api_uri}/game/decision"
 
-        # Use stored values if not provided
-        session_id = game_decision_request.session_id or self.session_id
-        client_id = game_decision_request.client_id or self.client_id
+        payload = game_decision_request.model_dump_json()
 
-        if not session_id or not client_id:
-            raise ValueError(
-                "Session ID and Client ID are required. Either provide them explicitly or call start_game first.")
+        try:
+            response = requests.post(decision_uri, data=payload, headers=self.headers)
+            response.raise_for_status()
 
-        url = f"{self.base_url}/game/decision"
-        payload = {
-            "decision": game_decision_request.decision,
-            "session_id": session_id,
-            "client_id": client_id
-        }
+            response_json = response.json()
+            validated_response = GameDecisionResponseDTO.model_validate(response_json)
+            logging.info("[+] Decision sent successfully")
 
-        response = requests.post(url, json=payload)
-        response.raise_for_status()  # Raise exception for HTTP errors
-
-        return response.json()
+            return validated_response
+        except Exception as e:
+            logging.error(f"[!] Failed to send a decision: {e}")
+            raise
diff --git a/services/player.py b/services/player.py
new file mode 100644
index 0000000..3cae73f
--- /dev/null
+++ b/services/player.py
@@ -0,0 +1,66 @@
+import logging
+import threading
+import time
+from typing import Literal, Dict, Any
+import config
+from dto.requests import GameStartRequestDTO, GameDecisionRequestDTO
+from services.julius_baer_api_client import JuliusBaerApiClient
+
+
+class Player:
+
+    def __init__(self):
+        self.client = JuliusBaerApiClient()
+        self._thread = None
+
+    def start(self):
+        self.play()
+
+    def play_on_separate_thread(self):
+        if self._thread and self._thread.is_alive():
+            logging.warning('Game loop already running.')
+            return self._thread
+
+        self._thread = threading.Thread(target=self.play, daemon=True)
+        self._thread.start()
+        return self._thread
+
+    def play(self):
+        print('playing')
+        payload = GameStartRequestDTO(player_name=config.API_TEAM)
+        start_response = self.client.start_game(payload)
+        logging.info(start_response)
+
+        status = ''
+        decision = self.make_decision(start_response.client_data)
+        while status not in ['gameover', 'complete']:
+
+            payload = GameDecisionRequestDTO(
+                decision=decision,
+                session_id=start_response.session_id,
+                client_id=start_response.client_id,
+            )
+
+            decision_response = self.client.send_decision(payload)
+            print(decision_response.status, decision_response.score)
+            status = decision_response.status
+            decision = self.make_decision(decision_response.client_data)
+            time.sleep(1.5)
+
+    def make_decision(self, client_data: Dict[str, Any]) -> Literal["Accept", "Reject"]:
+        # Do your magic!
+
+        return 'Accept'
+
+        # import random
+        # return random.choice(["Accept", "Reject"])
+
+
+if __name__ == '__main__':
+    player = Player()
+    player.start()
+
+
+
+
+
diff --git a/tests/test_cross_validate.py b/tests/test_cross_validate.py
new file mode 100644
index 0000000..9457c6e
--- /dev/null
+++ b/tests/test_cross_validate.py
@@ -0,0 +1,19 @@
+from validation import FromAccount
+
+
+account_data = FromAccount(
+    account_name="Astrid Janneke Willems",
+    account_holder_name="Astrid Janneke",
+    account_holder_surname="Willems",
+    passport_number="HW8642009",
+    reference_currency="EUR",
+    other_currency=None,
+    building_number="18",
+    street_name="Lijnbaan",
+    postal_code="7523 05",
+    city="Assen",
+    country="Netherlands",
+    name="Astrid Janneke Willems",
+    phone_number="+31 06 34579996",
+    email="astrid.willems@upcmail.nl"
+)
\ No newline at end of file
diff --git a/utils/__init__.py b/utils/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/validation/FromAccount.py b/validation/FromAccount.py
new file mode 100644
index 0000000..91307c8
--- /dev/null
+++ b/validation/FromAccount.py
@@ -0,0 +1,36 @@
+from typing import Literal, Optional, Self
+from pydantic import BaseModel, ConfigDict, EmailStr, Field, model_validator
+
+
+class FromAccount(BaseModel):
+    """
+    Fields which can be extracted from account.pdf
+    """
+    model_config = ConfigDict(validate_assignment=True, str_strip_whitespace=True)
+
+    # From account.pdf
+    account_name: str = Field(..., min_length=1)
+    account_holder_name: str = Field(..., min_length=1)
+    account_holder_surname: str = Field(..., min_length=1)
+
+    @model_validator(mode='after')
+    def check_account_name_is_name_surname(self) -> Self:
+        combined = f"{self.account_holder_name} {self.account_holder_surname}"
+        if combined != self.account_name:
+            raise ValueError(f'Account name is not name + surname: {self.account_name} != {combined}')
+        return self
+
+    passport_number: str = Field(..., min_length=5)
+
+    reference_currency: Literal["CHF", "EUR", "USD", "Other"]
+    other_currency: Optional[str] = None
+
+    building_number: str = Field(..., min_length=1)
+    street_name: str = Field(..., min_length=1)
+    postal_code: str = Field(..., min_length=1)
+    city: str = Field(..., min_length=1)
+    country: str = Field(..., min_length=1)
+
+    name: str = Field(..., min_length=1)
+    phone_number: str = Field(..., min_length=6)
+    email: EmailStr
\ No newline at end of file
diff --git a/validation/FromDescription.py b/validation/FromDescription.py
new file mode 100644
index 0000000..e19420e
--- /dev/null
+++ b/validation/FromDescription.py
@@ -0,0 +1,35 @@
+from typing import Literal, Optional
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class FromDescription(BaseModel):
+    """
+    Fields which can be extracted from description.txt
+    """
+    model_config = ConfigDict(validate_assignment=True, str_strip_whitespace=True)
+
+    
+    full_name: str = Field(..., min_length=1)
+    age: int = Field(..., ge=0, le=120)
+    nationality: str = Field(..., min_length=1)
+
+    marital_status: Literal["single", "married", "divorced", "widowed"]
+    has_children: bool
+
+    secondary_education_school: str
+    secondary_education_year: int = Field(..., ge=1900, le=2100)
+    university_name: str
+    university_graduation_year: int = Field(..., ge=1900, le=2100)
+
+    occupation_title: str
+    employer: str
+    start_year: int = Field(..., ge=1900, le=2100)
+    annual_salary_eur: float = Field(..., ge=0)
+
+    total_savings_eur: float = Field(..., ge=0)
+    has_properties: bool
+
+    inheritance_amount_eur: float = Field(..., ge=0)
+    inheritance_year: int = Field(..., ge=1900, le=2100)
+    inheritance_source: str
+
diff --git a/validation/FromPassport.py b/validation/FromPassport.py
new file mode 100644
index 0000000..773d135
--- /dev/null
+++ b/validation/FromPassport.py
@@ -0,0 +1,27 @@
+from datetime import date
+from typing import Literal
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class FromPassport(BaseModel):
+    """
+    Fields which can be extracted from description.txt
+    """
+    model_config = ConfigDict(validate_assignment=True, str_strip_whitespace=True)
+    
+    country: str = Field(..., min_length=3, max_length=3)  # ISO 3166-1 alpha-3
+    passport_number: str = Field(..., min_length=9, max_length=9, regex=r"^[A-Z0-9]{9}$")
+
+    surname: str = Field(..., min_length=1)
+    given_names: str = Field(..., min_length=1)
+
+    birth_date: date
+    citizenship: str = Field(..., min_length=2)
+    sex: Literal["M", "F"]
+
+    issue_date: date
+    expiry_date: date
+
+    signature_present: bool
+
+    machine_readable_zone: str = Field(..., min_length=44)
\ No newline at end of file
diff --git a/validation/FromProfile.py b/validation/FromProfile.py
new file mode 100644
index 0000000..64abbee
--- /dev/null
+++ b/validation/FromProfile.py
@@ -0,0 +1,65 @@
+from datetime import date
+from typing import List, Literal, Optional
+from pydantic import BaseModel, ConfigDict, EmailStr, Field
+
+
+class FromProfile(BaseModel):
+    """
+    Fields which can be extracted from description.txt
+    """
+    model_config = ConfigDict(validate_assignment=True, str_strip_whitespace=True)
+
+    first_name: str = Field(..., min_length=1)
+    last_name: str = Field(..., min_length=1)
+    date_of_birth: date
+    nationality: str
+    country_of_domicile: str
+    gender: Literal["Female", "Male"]
+
+    # ID information
+    passport_number: str = Field(..., min_length=9, max_length=9, regex=r"^[A-Z0-9]{9}$")
+    id_type: Literal["passport"]
+    id_issue_date: date
+    id_expiry_date: date
+
+    # Contact
+    phone: str = Field(..., min_length=8)
+    email: EmailStr
+    address: str
+
+    # Personal info
+    politically_exposed_person: bool
+    marital_status: Literal["Single", "Married", "Divorced", "Widowed"]
+    highest_education: Literal["Tertiary", "Secondary", "Primary", "None"]
+    education_history: Optional[str] = None
+
+    # Employment
+    employment_status: Literal["Employee", "Self-Employed", "Unemployed", "Retired", "Student", "Diplomat", "Military", "Homemaker", "Other"]
+    employment_since: Optional[int] = None
+    employer: Optional[str] = None
+    position: Optional[str] = None
+    annual_salary_eur: Optional[float] = None
+
+    # Wealth background
+    total_wealth_range: Literal["<1.5m", "1.5m-5m", "5m-10m", "10m-20m", "20m-50m", ">50m"]
+    origin_of_wealth: List[Literal["Employment", "Inheritance", "Business", "Investments", "Sale of real estate", "Retirement package", "Other"]]
+    inheritance_details: Optional[str] = None
+
+    # Assets
+    business_assets_eur: float = Field(..., ge=0)
+
+    # Income
+    estimated_annual_income: Literal["<250k", "250k-500k", "500k-1m", ">1m"]
+    income_country: str
+
+    # Account preferences
+    commercial_account: bool
+    investment_risk_profile: Literal["Low", "Moderate", "Considerable", "High"]
+    mandate_type: Literal["Advisory", "Discretionary"]
+    investment_experience: Literal["Inexperienced", "Experienced", "Expert"]
+    investment_horizon: Literal["Short", "Medium", "Long-Term"]
+    preferred_markets: List[str]
+
+    # Assets under management
+    total_aum: float
+    aum_to_transfer: float
\ No newline at end of file
diff --git a/validation/__init__.py b/validation/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/validation/cross_validate.py b/validation/cross_validate.py
new file mode 100644
index 0000000..928c460
--- /dev/null
+++ b/validation/cross_validate.py
@@ -0,0 +1,60 @@
+from enum import StrEnum
+from typing import Any, Callable, Optional
+from pydantic import BaseModel
+
+from validation import FromAccount, FromDescription, FromPassport, FromProfile
+
+
+class ExtractedData(BaseModel):
+    account: FromAccount
+    description: FromDescription
+    passport: FromPassport
+    profile: FromProfile
+
+
+class DocType(StrEnum):
+    account = "account"
+    description = "description"
+    passport = "passport"
+    profile = "profile"
+
+
+class XValFailure(BaseModel):
+    doc1_type: DocType
+    doc1_val: str
+
+    doc2_type: DocType
+    doc2_val: str
+
+
+def xval_name_account_description(data: ExtractedData) -> Optional[XValFailure]:
+    if data.account.account_holder_name != data.description.full_name:
+        return XValFailure(
+            doc1_type=DocType.account,
+            doc1_val=f"{data.account.account_holder_name=}",
+            doc2_type=DocType.description,
+            doc2_val=f"{data.description.full_name=}",
+        )
+
+
+def xval_email_account_profile(data: ExtractedData) -> Optional[XValFailure]:
+    if data.account.email != data.profile.email:
+        return XValFailure(
+            doc1_type=DocType.account,
+            doc1_val=f"{data.account.email=}",
+            doc2_type=DocType.profile,
+            doc2_val=f"{data.profile.email=}"
+        )
+
+
+def xref_all(data: ExtractedData) -> list[XValFailure]:
+    xref_validators: list[Callable[[ExtractedData], Optional[XValFailure]]] = [
+        xval_name_account_description
+    ]
+
+    validation_failures = []
+    for validator in xref_validators:
+        failure = validator(data)
+        if not failure is None:
+            validation_failures.append(failure)
+    return validation_failures