Belong to. According to Zhihu's inquiry, sporadic small transactions refer to standard transactions in which merchants pay taxes on a monthly basis and their monthly sales do not exceed 30,000. Selling clothes also belongs to. Wechat is a free application launched by Tencent on 2011121,which provides instant messaging service for intelligent terminals. It was created by the product team of Tencent Guangzhou R&D Center led by Zhang Xiaolong.