When I test my shop I get a 'PayPal Error 1' message

If you test your shop and get a 'PayPal Error 1' message, this is normally because your user authentication (merchant ID and vendor ID) is incorrect. Please check your details and if the problem persists, you will need to contact PayPal.

For more information, please go to www.paypal.com

Please note: This error should only occur if you are a Takeaway Website Pro user, with PayPal 'Express Checkout' enabled.