AbleCommerce Shopping Cart Software

I'd love to purchase the hosted solution, but
I'm mainly concerned about integration. Can Ablecommerce with one of the semi-dedicated
hosting plans:

1. Allow me to add multiple items at once to the cart via URL get request?
This is required b/c my CMS is a separate system that would then link to the
store.
2. Allow my customers to purchase a subscription product and then execute
some sort of custom script/code to activate that product subscription on
another system via web service or other means?
3. Allow my other system to authenticate against the ablecommerce user db or
allow for me to synch the passwords with a foreign system via web service or
other means?
4. Support recurring billing subscriptions with no end date?
5. Support recurring billing subscriptions where the subscription may be
upgraded? Example: A user started on the $15/mo plan and then after 3 months
wants to upgrade to the $21/mo plan. If so, can that upgrade purchase
trigger another custom code/script webservice or other call to a remote
system?

Thanks!

Harry

1. Allow me to add multiple items at once to the cart via URL get request?
This is required b/c my CMS is a separate system that would then link to the
store.

Read following topic about how to add items to basket through simple URL.
http://wiki.ablecommerce.com/index.php/ ... nal_entity

2. Allow my customers to purchase a subscription product and then execute
some sort of custom script/code to activate that product subscription on
another system via web service or other means?

This is possible, once order is placed you can put your custom code consuming third party web services at some suitable location to manipulate subscription.

3. Allow my other system to authenticate against the ablecommerce user db or
allow for me to synch the passwords with a foreign system via web service or
other means?

You can write a web service in your ablecommerce store to validate user names and passwords. Then you can consume this web service on your other system.

4. Support recurring billing subscriptions with no end date?

At the moment there is no option to remove requirement of end date but you can workaround it by putting some large Total Number of Payments. For example you can set total number of payments to 999.

5. Support recurring billing subscriptions where the subscription may be
upgraded? Example: A user started on the $15/mo plan and then after 3 months
wants to upgrade to the $21/mo plan. If so, can that upgrade purchase
trigger another custom code/script webservice or other call to a remote
system?

Yeah If you have the code at suitable location like OnePagCheckout's CheckedOut event handler that intercepts order right after checkout. You can then access user, order and subscription information and can trigger call to your external system.