review. Meituan's take-out of Shanghai big data can't go online because the account has not passed the review of big data. It is only necessary to upload the personal health code and white list to big data for re-review. Shanghai, referred to as "Shanghai" or "Shen" for short, is the largest economic center and an important international financial center city in China, and the first batch of coastal open cities. Shanghai is located in the east of China, at the mouth of the Yangtze River.