You should give a valid collateral since the amount is big ... this is no valid collateral because you could give any Amazon Gift card code and how we are supposed to know if it actually works or not without testing it ? this make no sense to me unless there is a method to check gift cards and balance on them .
Still , if we say it's valid collateral (amazon gc) + your account it's like 0.42 BTC .
I do not have a gift card, but aws amazon code
I know this does not make sense ..