we have 2 amember installations with 2 domains On our PP-Account we setup the IPN http://www.mydomain.com/payment/paypal/ipn but there is no opportunity to set a second link how we can use one Paypal account in both amember installations. Thx
You need just enable plugin on your second installation and configure it on aMember side. aMember send correct notify_url in payment request and PayPal should respond to this url instead of global one (you set up in PayPal settings). PayPal uses global url only in case there is not notify_url param in payment request. Please test it. It should works correctly.