Creating new sites in a network after taking payment

I am interested in integrating the User Registration addon + the GF PayPal addon (customized) with WPMUDEV's Pro Sites plugin and am looking for advice on the best approach & hooks to use. I'd be looking to create new sites in a network with a multi-step form that:

1) captures some contact data
2) uses Paypal pro to collect payment for a subscription via some add on (I know current version doesn't support PayPal pro)
3) returns to next step in mutli-step form to collect data about site to be created
4) after form submit (payment has been taken, validated form complete...), execute a function which exists in Pro Sites using data for the form

Do you see any problems with my approach or a better way to do it? My approach provides that the site is only created if payment is successful.

I'm unclear on:

- how to return to the next step in a multi-step form after successful payment
- how to get the numeric site ID of the site created by the user registration add on, which I need for the Pro Sites function

Any pointers or suggestions are appreciated.

I am interested also:)

Any luck with WPMUDEV forums?

http://premium.wpmudev.org/forums/forum/plugin-support

John said:

how to get the numeric site ID of the site created by the user registration add on, which I need for the Pro Sites function

You can reference the action hook 'gform_site_created' which will include the site_id in the first parameter.

Try the following:

add_action('gform_site_created', 'user_registration_site_created');

function user_registration_site_created($id, $user_id, $entry, $config, $password){
    //$id is the newly created site_id.
    execute_some_next_step($id);
}

I've not tested this specifically. However, this should get you in the right direction.