Question   If I provide the API key to a third party affiliate program, will a new member signup in that program automatically create an account in my site for that member?

A. Yes, it's editable by editing the .html file in the File Manager. 

The file you would edit is:
/uploads/adminpages/do-join.html

A. With a normal system using default settings, yes. If using direct payment to members, then no.

A. No, it is not possible with Direct Pay to have someone first make payment before creating their account.  They MUST create their account before payment for things to track correctly.

A. Yes, we do.  In the document linked below in the section update member there is details about the API that allows you to suspend a member.  When suspended they will not be able to receive new contacts from the capture pages.
https://webmarketingtool.com/admin/document.php?id=60

A. Yes, you can modify the signup page to have less fields.  All of the fields are required, but you can replace them with hidden fields and give them a default value (exa:  You can make a hidden field for address and give it the default value of "111 Main St" and then after they've joined they can go back and change it).  The minimum fields you can have on the join page is:
Name
Email
Password
Username

Technically, name is not required (but we do not recommend removing it).  Also, technically you could give them a default password, but we do not recommend that either.