Regarding the question of whether it is necessary to write cross-border customs clearance information when opening a store on Temu, the information I found is limited and insufficient to provide a clear answer.

Usually, cross-border e-commerce platforms will require sellers to provide necessary customs clearance information to ensure that the goods can pass through customs smoothly. This information may include a detailed description of the goods, value, origin, etc. It is recommended that you contact Temu's customer service directly or visit its official website to obtain the most accurate and detailed information. If you plan to conduct cross-border e-commerce through Temu, it is very important to understand and comply with relevant customs clearance regulations.