I am looking to start a couple of new websites, and I was wondering if it's possible to have customers accounts linked between, so if they make an account on 1, they Automatically have one on the other. Much like with Amazon, when you make an Amazon account, you have access to Amazon Prime Video, and all different regions with the same login. I want to build something with a subscription model, and give benefits over 2 sites.
Secondly, I was wondering if it's possible to 2 different account types for example, Buyers account and sellers accounts.
If anyone has any useful apps, or developers with experience in this field, or general knowledge, I would appreciate it greatly, thank you.