Bill acquiring business refers to various forms of electronic payment business, such as POS machines, code scanning payment and online payment. The head merchant refers to the merchant with the largest transaction volume and the largest contribution in the acquiring business. According to the query of China Popular Science Network, the head merchants of China's acquiring business are mainly concentrated in the following areas:

1. Online retail platforms, such as Tmall and JD.COM under Alibaba, have huge e-commerce transactions, which are growing every year.

2. Banking institutions: such as Industrial and Commercial Bank of China, China Construction Bank, etc. As traditional financial institutions, they expand their business scope and channels through acquiring business.

3. Catering enterprises: such as McDonald's and KFC. These fast food enterprises have many consumption scenes and high consumption frequency, so the proportion of electronic payment is also large.

4. Supermarket chain enterprises: For example, Wal-Mart and Carrefour, these supermarket chain enterprises are also big users of electronic payment, with a wide range of consumption scenarios and a large number of consumers, so they have also become one of the head merchants of acquiring business. It should be noted that different acquirers will have different head merchants. Therefore, specific to different institutions, their head merchants may also be different.