Question   Can we charge an admin fee before they fill out the join page?

A. In your members area, go to the "Advanced Features" page, then click on the "Misc" tab, then put the url for your webinar page in the "Redirect Page" field.
Put the full url, including http://. 
Also, put ?user=~username~ at the end of the url so that it will go to the appropriate member's page.

Exa:
http://yourdomain.com/webinar.php?user=~username~

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

The file you would edit is:
/adminpages/welcome.html

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, 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.

A. YES, it is possible to set it up using our API so that when someone joins the 3rd party system an account is created in the WMT Software.
If this is possible depends on the 3rd party software.
It would need to be modified so that when someone joins it, it calls the WMT API requesting that a new account is created.