Gift certificates can be redeemed in whole or in part. You do not need to use the entire value of the gift certificate at once, as the remaining value can be saved for later purchases.
Currently paper gift certificates can not be used for online sales. We will be implementing digital gift cards as soon as we can. The new digital gift cards will be able to be used online.
We will be willing to transfer over the value of paper gift certificates to the new gift cards when the new system is implemented.