How to set up a non digital item store inside app?

Hello, so I want to add a shop to my app where people can purchase real life items, like merch, is there a way I can go about this?

For example let's say I own the website merch(.)com (dont go there it might be real) and I sell merchandise like t shirts. If I make an app for my website how can I connect my app so that people may purchase my tshirts from my website (or server)?

I know about in app purchases but that is mainly for digital items like extra lives and upgrades and not real life items that they may receive by mail and I don't know how to go about this.

• Should I connect to my website and just let them make purchases through my website?

• Should I connect to my server so it's easier on the app?

• Is there even any plug ins or assets on the unity store that can facilitate this?

I'm struggling to find answers where to even start, if anyone can help me I would appreciate it. Thank you!