import hashlib
import json
from decimal import Decimal
from typing import Any


def _json_default(value: Any) -> str:
    if isinstance(value, Decimal):
        return str(value)
    return str(value)


def stable_payload_hash(payload: dict[str, Any]) -> str:
    serialized = json.dumps(payload, sort_keys=True, default=_json_default, separators=(",", ":"))
    return hashlib.sha256(serialized.encode("utf-8")).hexdigest()