is the integration code set correctly? many WHMCS users here in forum did the integration before, most of them had the same issue "how to integrate it".   in complete.tpl file you need to place your Javascript code between these lines {if $ispaid} <!-- Enter any HTML code which needs to be displayed once a user has completed the checkout of their order here - for example conversion tracking and affiliate tracking scripts --> {/if}   but in TPL files you need to wrap you Javascr