fix(pally): align webhook handler with official API spec

tests/send_pally_webhook.py

@@ -22,16 +22,12 @@ load_dotenv()
 ENDPOINT = "/pally/result"
 
 def calculate_signature(
-    payment_id: str,
-    status: str,
-    req_amount: str,
-    currency: str,
-    order_id: str,
+    out_sum: str,
+    inv_id: str,
     pally_token: str,
 ) -> str:
-    raw = f"{payment_id}{status}{req_amount}{currency}{order_id}{pally_token}"
-    md5 = hashlib.md5(raw.encode()).hexdigest()
-    return hashlib.sha1(md5.encode()).hexdigest()
+    raw = f"{out_sum}:{inv_id}:{pally_token}"
+    return hashlib.md5(raw.encode()).hexdigest().upper()
 
 
 def main():