fast donkey must be a merchant to place an order. The reasons why fast donkey can only be placed by merchants are as follows:

1. Fast donkey is a B2B platform of Alibaba's catering supply chain, which mainly provides food and food-related products and services for catering merchants.

2. Fast Donkey is positioned as a platform of catering supply chain, which is committed to improving the efficiency and transparency of catering supply chain through Internet technology.