how you can integrate amember professional with joomla. Please suggest a concept, more to the point I wish to understand how the subscription process works in amember professional

There must be an element and modules that you could install to integrate with Joomla. Check this out thread http://amember.com/forum/showthread.php?t=4721

the way the subscription process works in amember professional - customers subscribe and pay subscription free. PayPal supports monthly subscriptions and does renewal instantly. Upon getting money PayPal transmits you and also IPN (you'll have to arrange it, seek advice from amember professional what's the IPN url). Certain page in your website will recieve the IPN Message from PayPal and renew the subscription. If customers doesn't pay, can get blocked.

Check that one out! Spend some time and have fun with the demo on that one http://extensions.joomla.org/extensions/e-commerce/paid-membership-a-subscriptions/7591

Take a look page out, you may have the ability to find alternative http://extensions.joomla.org/extensions/e-commerce/paid-membership-a-subscriptions