Writing a simple shop

[Fuzzy Orange]

I want to write a simple shop system for my website so that people can buy merchandise

I've been a PHP/mysql developer for over 6 years now so I have no problem doing that - but I want it to use the vbulletin user system so I know which users have ordered what

Also I'd like it to fit into the site nicely - with a link on the top menu and the breadcrumb system still working "Home -> Shop" etc..

I found a plugin that allows me to add menu items, but I'm a little hazy on how I start writing php pages that use the vbulletin layout and permission system

I'm using Vbulletin 4.x - which I'm new to

Is this guide the only way -> https://vborg.vbsupport.ru/showthread.php?t=228928

I find putting all my html for the shop into one big variable and then pushing that into a template a bit of a bad way of doing it but if there is no alternative i'll give it a go

Thanks for your time