[HELP] - Proper Alternative to Amember?

Hi guys,

I need some help and advises from your side. I am looking for a quality alternative to Amember.com

We build a WordPress plugin now which we will offer free limited + premium with custom options. I am looking for a viable solution as Amember looks very dirty.

Requirments

Stripe / PayPal integration
Generated unique API key after payment or as a free member with limited options.
User panel of course
Ability to white list the website where use the plugin

It`s there something up there on the market?

Thank you in advance!