Building membership site with GF and Members

I've been looking through the code a bit and found three hooks that might be good possibilities to use: gform_paypal_post_ipn, gform_post_payment_status, and gform_paypal_fulfillment. The last one seems like the best hook for my needs.

The goal is to create a function that will change the user's role to "gold_membership" upon successful completion of the payment. This form would only be shown to logged-in users with the default subscriber role. Here's what I'm thinking might work. What do you guys think?

add_action( 'gform_paypal_fulfillment', 'my_update_user_role' );

function my_update_user_role() {
	global $current_user;

	if ( !empty( $current_user->ID ) ) {
		$new_user = new WP_User( $current_user->ID );

		if ( !empty( $new_user ) )
			$new_user->set_role( 'gold_membership' );
	}
}

Hi,
I just downloaded GF (with a developer's license) and Members a few days ago, and I'm trying to do something similar to what Justin is describing here.

I'm building a crowdsourced investigative journalism site. I want to give people a choice to access certain restricted content: Either make a donation, or spend a minute filling out a form. Once they do either, I want them to get a password that's valid for a month or a year, depending on whether they gave money or completed the form.

How can I make this work? Should I wait for the User Registration Add-On? Assume that my PHP knowledge is minimal, but that I can copy-paste code like a champ.

I'm good with developing my own features and can deal with existing users accordingly. Building a membership site is simple. Knowing how to interact with the payment system is the only thing I'm unfamiliar with. The biggest thing I need is the appropriate hook to switch a user's role based on a few bits of information.

All I really need to know for sure is a few of things:

* When a user has successfully paid for something.
* Exactly what that user purchased.
* What that user's ID is.

I'd also need to know the opposite:

* When a refund was issued.
* What product the refund was for.
* What the user's ID is.

If I know the correct hook to get this information, I can make pretty much anything I need happen.

Has any progress been made on this?
With the PayPal addon, User Registration addon, and Members plugin, you could come up with nearly a perfect membership system.
I say 'nearly' because ideally I'd have a subscription-based payment, and when the subscription is cancelled by a member via PayPal, then PayPal would notify the Members plugin so that accesss to protected content is cut off at the end of the billing cycle.
I know this is possible because it's how the eMember plugin works. There's something called a subscription ID that PayPal creates and eMember recognizes.
But I like the way Members looks like it works, it's free, and I have a lot of respect for Justin Tadlock as a developer. And Gravity Forms is the best thing since sliced bread.

Thanks for the update.