I thought about using Mt. Gox when Mybitcoin went down this time but saw this notice: "Merchant service are currently unavailable, but will be back soon."
Are Merchant Services available again? If so, you should remove that notice.
Please contact me (
admin@mtgox.com) so we can discuss your needs as a merchant, and so we can provide the best API for you. We got no merchant on our system so far who expressed a need for any merchant system, however we can get things done quickly if you let us know exactly what kind of payment interface you need.