Build Me An SMM Panel Website

Some time ago I worked with an SMM Panel, they gave me my own domain and site, and my clients registered and contracted the services of their SMM Panel in my site, with a little higher price for me. I understand that this is done through the API, but I'm not completely sure. I have an SMM Panel Script I purchased a while back that I would like to be implemented into the site. The code may have a flaw or two that was causing it not to work properly through the final stages of ordering but if you are experienced in this area that shouldn't be a problem.