[Python] Verify an App Store receipt always staus code 21003

I'm trying to verify a receipt with the App Store server in the sandbox environment. I've checked all values are correct but keep receiving:

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


My code:

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()




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