Create a submission for other people

Hi,
I would like to ask if it is possible to set the username after purchasing an account.
I’m working on a site where in a user or a visitor can buy an account for other people as a gift.

The process can be like.
Submit the email address of recipient -> pay through paypal using the giver’s account -> The recipient receives an email with a link where he can set his username and password.

Is this flow possible? Or is there a way to let people change their usernames once?
Another thing, when a user is logged in, his email address and username is automatically set in the forms? Is there a way to disable it?

Also, I’m still reading about paypal pro forms. I’m still testing my site using Paypal Sandbox. Can S2member be set up using a premier? Can PayPal Pro Forms can still be used using Paypal Standard and Advanced Business Accounts?

Sorry for the many questions. Thanks in advance!

Thanks for your inquiry. ~ We appreciate your patience :-)

Is this flow possible? Or is there a way to let people change their usernames once?
Another thing, when a user is logged in, his email address and username is automatically set in the forms? Is there a way to disable it?

No. I’m sorry but Username’s cannot be changed. This is a standard set by the WordPress core and s2Member® also obeys this rule. It’s possible to change it in the database of course, but that is not something that WordPress or s2Member would expect to see. Therefore, I cannot recommend this.

Also, I’m still reading about paypal pro forms. I’m still testing my site using Paypal Sandbox. Can S2member be set up using a premier? Can PayPal Pro Forms can still be used using Paypal Standard and Advanced Business Accounts?

I’m not sure that I understand this question. Premier? Sorry, please elaborate until I do. I think what you’re asking is about this. See: Knowledge Base » PayPal® Compatibility (Account Types)