Customers who already have a credit card can submit an application for upgrading their gold card and attach additional financial documents. Upgrade route: 1. Download and fill in the gold card application form through online banking (some types of cards can be applied directly through online banking without printing). If there is any proof of new financial resources, send it by express mail to B 1 conference reception room of China Merchants Bank Credit Card Center, No.686 Lai 'an Road, Pudong New Area, Shanghai, with postal code of 201KLOC-0/. 2. Fill in the gold card application form at the counter with the proof documents of new financial resources.