大家好，我最近在做App Store沙箱环境下的收据验证功能，已经反复核对了所有参数的正确性，但每次请求都会收到状态码21003的响应，实在摸不着头绪，想请教下各位有没有遇到过类似问题，或者能帮我排查下问题出在哪？

我收到的响应内容是：

{
    "environment": "Sandbox", 
    "status": 21003
}

以下是我用于验证的Python代码：

def verify_receipt(receipt_data: str, sandbox: bool = True) -> dict:
    """
    Verify an App Store receipt with Apple's verification service

    Args:
        receipt_data: The base64 encoded receipt data
        sandbox: Whether to use sandbox environment (default True)

    Returns:
        dict: The verification response from Apple
    """
    # URLs for verification
    SANDBOX_URL = "https://sandbox.itunes.apple.com/verifyReceipt"
    PRODUCTION_URL = "https://buy.itunes.apple.com/verifyReceipt"

    # Shared secret from App Store Connect
    SHARED_SECRET = "xxx......"

    # Prepare the verification URL
    verify_url = SANDBOX_URL if sandbox else PRODUCTION_URL

    # Prepare the request payload
    payload = {
        'receipt-data': receipt_data,
        'password': SHARED_SECRET,
        'exclude-old-transactions': True
    }
    response = requests.post(verify_url, json=payload)
    result = response.json()

我的共享密钥是从App Store Connect获取的，截图如下：

备注：内容来源于stack exchange，提问作者Quang Lê