I have an established Wix website that sells downloadable video clips. It used to accept PayPal payments for video downloads, but now I am changing from PayPal to Zombaio. This requires code to be added to the site (Zombaio provide some of the code and full instructions). I usually do my editing / development of the site using the Wix non-specialist drag-and-drop front end, but this will not let me change the code. Instead you have to use the Wix code editor but I am not an html programmer and I do not feel confident enough to make the changes. The required changes are very precise and are a legal requirement for card providers (MasterCard, etc) so they will need to be done carefully and accurately.