Desenvolver um Software

Hi everyone! I need someone to 'modify' and existing JS tag. Briefly, there is company that can save some data from my website just inserting their tag there. We pay them to save those data from users who starts our checkout process and then quit for some reason, to they send an email to those users asking him to back to our site and make the purchase. We want to have this internal. So attached you have their tag to modify it to point to my domain and my database. Somethings that are very important here: 1 - It have to work exactly as their tag. They don't have any access to our website and can save these data from us in their external domain 2 - It works 100% through Google Tag Manager. We don't need to modify anything on our website 3 - It CAN NOT (NEVER) start any problem with SSL/HTTPS protocols. Everything have to still working 100% normal 4 - We will save all data on ANOTHER DOMAIN (for security reasons) 5 - As we are always changing our site layout, we need to be able to change what fields we want to save (just give us the directions to change variables name, etc) Probable there are lots of questions about it, so please just tell me if you need some other informations. Offhand, thank you!