Data tracking for admins from payment page of my website

My purpose to run a website having much more category of products. No products are my own. All products search/details page will be iframed of some other website. I have a website having main home page and other common pages like about us, contact us etc.. In my header menu there are 5 menus which have separate a mini home page. All these mini home page – have my only header and footer & main body will be iframe of 5 different sites. My all these 5 mini home page has my own header and footer only. Main body is total iframe of other websites. In iframe, there is products details, price etc in continuation 2 or 3 or 5 iframe pages. My customer search/choose products from iframe. But at the time of payment I want to take back the customers at my own pages (without any iframe). Customer fills their own infos and go to my own payment gateway. After successful payment they will return to my webpage. All infos ( customer personal infos + product purchased infos + financial infos) should come to my admin as well as on other respective website admin(whose iframe is being used). Access of server of all 5 websites ( whose feed is being used here) is with us but limited. So what you will give to upload as a file or in table we will do here. We will do these with ur guidance/instruction on teamviewer. These 5 websites are exclusively for this purpose so that we will have to change the link of final check out button. We have to link these check out button to [login to view URL] { my website name will be dynamic/variable}* [login to view URL] file will remain at my site’sserver. Here all datas will be tracked then it redirects to [login to view URL] file (it will at third party server). [login to view URL] file has all work done already and working.(you only have to send correctly to payment.php. From [login to view URL] it will go to gateway and after successful payment returns to [login to view URL] *this iframe is not being used by only my site, it will be used some other site as well at the same time. All will enjoy this facility. So here have to keep in mind to link checkout button dynamically. Price below 350$ Max time 5 days.