diff --git a/studspider.py b/studspider.py
index 6255678..1af454d 100644
--- a/studspider.py
+++ b/studspider.py
@@ -13,7 +13,9 @@ dotenv.load_dotenv()
 from square.utils.webhooks_helper import verify_signature
 
 # Configuration
-SQUARE_WEBHOOK_SIGNATURE_KEY = os.getenv("SANDBOX_SQUARE_WEBHOOK_INVENTORY_ID")
+SQUARE_WEBHOOK_SIGNATURE_KEY = os.getenv("SANDBOX_SQUARE_SIGNATURE_KEY") or os.getenv(
+    "PROD_SQUARE_SIGNATURE_KEY"
+)
 SQUARE_WEBHOOK_URL = os.getenv("SQUARE_WEBHOOK_URL")
 
 # Debug: Print configuration (redact key)