Credit Card Error: "Parameter Invalid Empty"

If you receive the parameter_invalid_empy error code, this means one of the required fields on the checkout page is empty. Try filling out all required fields again to process your order. 

Note: You may see this following message on the checkout page which provides additional context about the error code - "You passed an empty string for 'email'. We assume empty values are an attempt to unset a parameter; however 'email' cannot be unset. You should remove 'email' from your request or supply a non-empty value."