no doubt a wire. proving delivery is a pain, not to mention they can charge back for quite a while after the sale. nothing worse than seeing your account depleted for $xx,xxx 2+ months after the sale.
and if it's visa/mc all they have to do is call and bam! instant chargeback. the onus is on the merchant to prove enough to have it reversed.
i always have my big customers pay by wire 1st, then they can use a charge card, after showing their intent to do legitimate business.
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