Doudian is an e-commerce platform. If you want to view your traffic expenses, you can follow the steps below:

1. Open the Doudian APP and enter the personal center page.

2. On the personal center page, find and click "My Wallet" or a similar option.

3. On the wallet page, you can see information such as account balance, income and expenditure details. Find and click "Traffic Expenses" or a similar option.

4. On the traffic expenses page, you can view your traffic expenses, including the amount spent, the remaining amount, etc.

Please note that the above steps are for reference only, and the specific operations may vary due to the Doudian APP version or interface adjustments. If you encounter problems during the operation, it is recommended that you consult the official help documents of Doudian or contact Doudian customer service for consultation.