Hello. I'm working on a Zoho application that I hope to share with "public" users whom I would like for them to purchase goods from my site. After they make a transaction,I'd like for them to be able to "login" to my application without requiring them to obtain a Zoho account (sort of like an e-commerce application) so that they can securely view their own orders, payments, submit customer services questions, etc. I'd like to personalize their experience as they register in my site and do business with me.

What would be the best way to do this without having to make them obtain a Zoho account? and yet gain access to certain "non-public" or secured areas of my application?

Thanks.