You can open the Selected Alliance by entering Doudian for 0 Yuan. Doudian provides a policy of 0 Yuan entry, which allows more merchants to enter the platform. At the same time, in order to improve the user's purchasing experience, Doudian has established the Selected Alliance to provide users with better shopping recommendations by reviewing the quality and services of merchants. In order to allow more merchants to benefit from the Doudian platform, Doudian allows merchants who enter for 0 Yuan to open the Selected Alliance. Merchants only need to meet the platform regulations and achieve a certain level of good reviews and transaction volume. To open the Selected Alliance, merchants need to meet the regulatory requirements of the Doudian platform, such as providing high-quality goods and services, ensuring logistics time and quality, etc. At the same time, merchants also need to actively carry out promotional activities, increase store exposure, and improve user stickiness in order to obtain more good reviews and transaction volume, thereby meeting the conditions for opening the Selected Alliance.