Will integrate with aMember, but a few lines of customization is needed to the aMember code.

You can customize the payment levels, per click (visitor), percentage or straight fee.

Integrates with aMember, you just need to customize the thanks.html page or the paypal IPN in the settings area of aMember.

Various combinations of PAP are available with help-desk software.

$99 is for a single site license with free installation. 

For $299 they will install, integrate into your shopping cart, and customize the look and feel for you.

1Shopping Cart is not a payment processor directly. They provide additionals services such as autoresponders and an affiliate program that integrates with the membership software and the final payment processor.

You will still need to process payments with a merchant account or another service. * May not work with paypal recurring.

JAM is a 3rd party affiliate script which interacts with both your membership script and your payment processor. It is very extensive and detailed, so will take a far amount of time to customize. It provides a very nice interface for your affiliates.

If integrated with aMember, it can provide an automated signup and refund system. You will need change a couple of lines of php code.

You will still need to manually process your affiliate payments. 

Paydotcom overlaps payment processing by Paypal. Paydotcom provides an affiliate program, and promotion of your affiliate program.

You will still need to manually process your affiliate payments.