Has anyone done the freeshipping.com trial?

Hi Everyone, first posted topic in this great sub-reddit :)

I recently placed an order at MonoPrice, and in the confirmation e-mail there was a link to get 10% back on my order ($10).

Follow the link, and it's a sign up for a free 7-day trial deal.

-Has anyone done the trial for this site? -How many days do you have to stay signed up before cancelling your "subscription" before they process your rebate.

Tried reading through their terms to find an answer, but couldn't really see one.

Thanks for any help! :)