Credit Cards: Credit cards are widely accepted. For lost cards : 
American Express Tel : (662) 273 5100 or (662) 273 0022 
Diners Club Tel : (662) 238 2920 or (662) 238 2680 
Master Card Tel : (662) 256 7326-7 
Visa Tel : (662) 256 7326-7

Tipping : Tipping is not a usual practice in Thailand although it is becoming more common. Most hotels and restaurants add a 10% service charge to the bill. Taxi drivers do not require a tip, but the gesture is appreciated and 10-20 Baht is acceptable for porters.

Bargaining : Fixed prices are the norm in department stores, but at most other places bargaining is to be expected. Generally, you can obtain a final figure of between 10-40% lower than the original asking price. Much depends on your skills and the shopkeeper's mood. But remember, Thais appreciate good manners and a sense of humor. With patience and a broad smile, you will not only get a better price, you will also enjoy shopping as an art.

V.A.T. Refunds : Visitors entering the Kingdom on a tourist visa are entitled to refund of the 7% V.A.T. on goods purchased at registered retail outlets.