Amember can do this...?

Hi,

I had developed a web service, to sell it with Clickbank like a subscription. To integrate the amember with my web service I need to know if I can do this:

- When user register in aMember, and pay for the first month, aMember can notify my web service calling a customized fuction to activate the user in our system?

- When the user cancel the subscription, refund, chargeback or not pay it. I can get aMember to notify my web service calling a custom function to disable the access ?

- Can I use my custom form of login/register?

- Can I access to the session vars of the aMember?


Thanks

Thanks for your answer. Another one:

For how many sites I can install amember? Because we are developing our web service in a local web server. And will migrate that to the public server.

Should I get only one license to use local, and when we can to move to the public server we can change it? Or should buy two licenses?

Thanks