On the AliExpress platform, if a customer places an order maliciously and chooses a product with a higher postage just to make up the 1 yuan difference, this is indeed a tricky problem. When dealing with this situation, you can consider the following steps:

1. **Verify the order situation**: First, confirm whether the order is indeed malicious, such as a customer placing two orders at the same time, one order is for the product he actually wants to buy, and the other order is for a product with a higher postage to make up the difference.

2. **Contact the buyer**: Communicate with the buyer to understand his true intention of placing the order. There may be misunderstandings or the buyer does not understand the correct ordering process.

3. **Provide solutions**: If it is confirmed that the buyer made a mistake, you can provide a friendly solution, such as guiding the buyer to cancel the wrong order and place a new order.

4. **Explain the platform rules**: Explain the shopping policies and rules of AliExpress to the buyer, let him understand the correct shopping process, and avoid similar situations from happening again.

5. **Record the communication**: Keep the communication records with the buyer in case of emergency.

6. **Follow the platform rules**: Handle such issues according to the rules and procedures of AliExpress, and ensure that your handling method complies with the platform regulations.

7. **Seek help from the platform**: If you cannot solve it yourself, you can contact AliExpress customer service for help, and they may provide more professional solutions.

8. **Improve store policies**: In order to avoid similar problems, you can clarify the shopping policies and procedures in the store, especially the handling of postage and price differences.

When dealing with such issues, it is important to maintain a patient and professional attitude, and at the same time ensure that your handling method complies with the platform rules of AliExpress and Chinese laws and regulations.