The arb api doc requires a credit card number for new arb subscriptions. 

See http://www.authorize.net/support/ARB_guide.pdf pg 10, CreditCard xml element.

BUT, the online merchant interface transaction detail screen on the web site enables an ARB Subscription to be created from a previous transaction. 

I want to use the same capabiliy via an api--creating an arb subscription by sending a prior transaction id for a person. -- It would be also ok to use a CIM ref number.

Why: I want to create an arb without the credit card number passing through my system (to minimize PCI issues).

Is this possible now? Is it planned?

Thanks.