I know iframes might do it but thats bad right? is there something server side that will load pages from another host under my URL. This is legal, as we want to present our reseller account under our URL. Thank you
You'll need a proxy passthrough. Someone requests a URL containing your hostname, and your server will then pull the content from elsewhere and then serve it to the user. The user will not visit the other site at all. They will transact only with your site.
There's many prior threads with example code.
One problem that arises is as soon as the user clicks any links on the page they will be requesting that page from the real site. To stop that happening, you'll have to change the links on the pages before you serve the page to the customer.
Another problem is that your site and the real site will now be serving Duplicate Content. One of the sites is going to fail to rank, as Google will not want to show both sites in the SERPs.