Our citibank card was charged by AHCLPay and gatterbill.com (also shows as gaterbill.com, pay-gaterbill.com), last year with ccbill.com. All unauthorized charges ranging from $1 or $5 to test the card, or what looks seemingly like a subscription charge of $34.95. Citibank froze the card recently for the AHCLPay and gatterbill.com transactions since Citi's system flagged it as a suspicious charge for online activity and/or with overseas based addresses. We're fairly conservative about the card usage with mostly recurring billings that we're familiar with...I think the only weird thing is DVD rental machines requiring a card swipe.