I have a 5-step signup page.
User enters business info, staff information, office info, doctor information. Clicks save. Then page goes to payapl or whatever payment method and pays and now they're registered for the site.
Suppose business name is "abc company". How can I make sure this company doesnt sign up more than once? for example, office ABC Company has signed up...then they make a mistake and signup again and pay again. How can I prevent that? I thought about company name, address or office info but I dont that's full proof...for example...what if on the first signup...user enters "ABC Company" and sign up but on second signup they enter "ABC Comp"...
should it be by someone's email? address, a combination? not sure how to prevent an office from signing up over and over again?