Many merchants falsely believe that if you are hit with a chargeback from American Express you will automatically lose the battle. It is true that Amex is a harder battle to fight than other credit card issuers. Part of the reason for this is based on the fact that Amex charges a “membership fee” rather than most other credit card issuers who either issue a credit card for free or charge an annual fee for the card.
American Express is one of the largest card issuers in the whole world. It is also a very popular payment method at casinos online. For us at Casinomir safety is everything and American Express is perhaps the safest card out there. One even better thing is that casinos usually doesn’t charge AMEX transactions. A: Visa, Master-Card and American Express have different rules governing what online sign-up measures will be sufficient to prove that the cardholder accepted your cancellation policy. About Card Member Disputes A dispute occurs when a Card Member contacts American Express to question a charge on their statement that they don't recognise. A chargeback occurs when, after investigation of the dispute, we debit your account for the amount of the disputed transaction and credit the Card Member with this amount.
Based on this same logic, Amex sees their customers as “members” rather than “card holders” as other companies such as Visa and MasterCard do. Amex even calls their customers, “card members” and to that end, they tend to protect their members more than their merchants.
American Express Chargeback Guide
However, all is not lost simply because of this distinction. Amex still views each and every dispute with fairness and it is possible to have Amex side with a merchant provided the merchant has handled the transaction according to the terms spelled out in the Merchant Agreement. One of Amex big sticklers is the requirement of a signature. Even if you don’t get a signature, it is possible to still win if there is a paper trail that proves the transaction was a legitimate one and the card member agreed to the sale and the merchant terms of the sale.

In one particular case, an Amex merchant took a phone order for services to be delivered in the future. Following the phone call, the merchant sent the Amex card member a written confirmation and receipt for a deposit clearly outlining the terms of a cancellation. The card member sent a reply back to the merchant specifically acknowledging the terms of a cancellation and threw out a, “What if” question about a possible cancellation. The merchant responded with a statement indicating the deposit would be forfeited in the event of a last minute cancellation. The card member wrote back to the merchant and indicated it shouldn’t be an issue. It did become an issue and the merchant refused to refund the deposit. The card member filed a dispute.
In conclusion, Amex viewed the supporting documentation provided by the merchant and determined the merchant was entitled to retain the deposit and the amount that had been deducted when the chargeback was initiated was returned to the merchant.
The moral of the story is to keep copies of anything and everything that can be used to help present your case to the credit card issuer.