Free trial subscription possible?

-- url of the page with the problem -- : n/a
-- HikaShop version -- : Business 2.3.0
-- Joomla version -- : 3.3.1

I've got HS and AkeebaSubs and the recurring payment plugin installed.

I need to be able to have a 'free trial' of x days for a subscription.
I know that Paypal allows that type of transaction with their recurring profiles.
Is there any way within HS to make that happen?

i.e.
Subscription price: $100
Payment count: 1
Free trial: $0 for 15 days

So they would enter their payment info (and agree to the payment terms) but not be billed until 15 days later, and at that point be billed the $100 for the subscription.