diff --git a/python/fh_sdk.py b/python/fh_sdk.py
index c32602c..cbac736 100644
--- a/python/fh_sdk.py
+++ b/python/fh_sdk.py
@@ -1,28 +1,35 @@
-from typing import List, Optional
-from pydantic import BaseModel
 from enum import Enum
+from typing import List, Optional
 
 import requests
+from pydantic import BaseModel
 
 
 class BaseError(Exception):
-    ...
+    detail: str = "BaseError"
+
+    def __str__(self) -> str:
+        return self.detail
 
 
 class PositionError(BaseError):
-    ...
+    detail = "Invalid position"
 
 
 class PlayerInactiveError(BaseError):
-    ...
+    detail = "Player inactive"
 
 
 class PlayerNotFoundError(BaseError):
-    ...
+    detail = "Player not found"
+
+
+class GameLockedError(BaseError):
+    detail = "Game locked. Product selection in progress."
 
 
 class ValidationError(BaseError):
-    ...
+    detail = "Validation error"
 
 
 class Direction(str, Enum):
@@ -63,12 +70,6 @@ class Player(BaseModel):
     state: PlayerState
 
 
-class Product(BaseModel):
-    name: str
-    id: str
-    description: Optional[str] = None
-
-
 class PingResponse(BaseModel):
     message: str
 
@@ -88,10 +89,6 @@ class GameInfoResponse(BaseModel):
     destination: Destination
 
 
-class ProductListResponse(BaseModel):
-    products: List[Product]
-
-
 class FairHopper:
     def __init__(self, host: str) -> None:
         self.host = host
@@ -160,42 +157,9 @@ class FairHopper:
             raise PositionError()
         elif r.status_code == 422:
             raise ValidationError()
+        elif r.status_code == 423:
+            raise GameLockedError()
         else:
             r.raise_for_status()
 
         return PlayerInfoResponse(**r.json())
-
-    def get_products(self) -> List[Product]:
-        r = requests.get(self.format_url("/products"))
-        response_data = ProductListResponse(**r.json())
-        return response_data.products
-
-    def get_product(self, product_id: str) -> Product:
-        r = requests.get(self.format_url(f"/products/{product_id}"))
-
-        if r.status_code == 422:
-            raise ValidationError()
-        else:
-            r.raise_for_status()
-
-        return Product(**r.json())
-
-    def purchase_product(self, player_id: str, product_id: str) -> Product:
-        url = self.format_url(f"/player/{player_id}/product/purchase")
-        payload = {
-            "product_id": product_id,
-        }
-        r = requests.post(url, json=payload)
-
-        if r.status_code == 403:
-            raise PlayerInactiveError()
-        elif r.status_code == 404:
-            raise PlayerNotFoundError()
-        elif r.status_code == 409:
-            raise PositionError()
-        elif r.status_code == 422:
-            raise ValidationError()
-        else:
-            r.raise_for_status()
-
-        return Product(**r.json())