What does the buyer mean by purchasing?

It is a business model, which refers to a service provider who buys goods or services as an agent.

Buyers' purchasing is a professional shopping agent who buys goods or services on behalf of customers according to their needs and requirements. The service scope can be very wide, covering clothing, shoes and hats, cosmetics, electronic products, luxury goods and other commodities. Buyers can also provide international purchasing services to help customers buy goods from overseas and carry out cross-border transportation and customs clearance procedures.