Page 1 / 2 Dah Sing "My Favorite Merchant" Credit Card Registration Page Promotion period of 10X Cash Rebate on Dah Sing "My Favorite Merchant" Credit Card was ended on 31 December, 2013. How to register for "My Favorite Merchant"? "My Favorite Merchant" Smart Tips View "My Favorite Merchant" Demo Video (Chinese Version Only) Please fill in the following information. Dah Sing "My Favorite Merchant" Credit Card Number: CVV2/CVC2 (What is CVV2/CVC2?): What is CVV2/CVC2? CVV2/CVC2 is the verification code on the back of your credit card. Please input the last 3 digits only. First 4 digits of HKID / Passport Number: (Excluding alphabets) Login