It is not possible to add a custom amount of balance that is below the minimum required
Paying with PayPal in the Battle.net Shop requires the PayPal account to be verified
How to receive help with balance codes that cannot be read
Information regarding resources which can be used to locate the next quest in a chain.
Information about accidentally claiming a WoW token for either game time or Battle.net Balance
Information about using PayPal Balance to make purchases in the Battle.net Shop.