Error from paypal button

so i have tried to setup my paypal buttons more then once but it doesnt seem to want to work.
i have checked my pay pal options multiple times. everything is supposed to work but when access paypals side i get access denied.

edited: so i used the short code and it worked. is there an issue with using the full code from the button generator?

Hi Alex.

The HTML code is trickier to use, because it requires some variables, so you’d need to have PHP execution on your page, or replace the variables with shortcode equivalents.

The shortcode is the preferred method. Is the shortcode enough for your user or do you require to use the HTML for some reason?