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What does the number starting with a when applying for a credit card from China Construction Bank mean? It used to be 99 and 89.

After the CCB system was upgraded, the application code changed. It turns out that the code starting with 99 means the credit card applied for through online banking, and the code starting with 89 means the credit card applied through mobile banking. I applied for a JCB card on the credit card website a while ago. The application number starts with A3. My friend applied through WeChat and the application number is AD, so I think A represents credit card application, D represents application through WeChat channel, 3 online credit card Website application, over-the-counter application, or online banking application all have different codes.