hi,im new in here, i have some question :

can i use more than 1 voucher for a same account? if so,how many maximum voucher that i can use for 1 account? (buy from blackhatworld adwords voucher)

if i want to buy 2 vouchers,is there a expiry date for those voucher?

can i use that directly to post an advertisement on google?

is that safe if i use the adwords voucher for many times? can google banned my accoun because of that?

million thanks