Unique Subscriber/Customer ID with Authorize.net ARB

[lduros]

Hi:

I am trying to detect whether or not a customer entering a credit card and billing info is purchasing a given subscription item for the first time or not (I want to grant a free trial or not using a startDate in a few days or on the same day.) Does ARB return any unique customer id or a unique subscriber id? I still want to allow someone to make multiple purchases of the same item (using an invoice id to prevent the duplicate error.), but it would be nice to be able to tell whether this is the first time they are buying this item or not using name/location/credit card information. PayPal has something called a "Unique subscriber ID" for this purpose.

Thanks,

[lduros]

OK, looks like CIM is more likely to give me what I want on that end. Correct?

[RaynorC1emen7]

CIM could do that as long as they(customer) give you the same information.