How does property management cooperate with access control system suppliers?

I'm from a property management company. If the quantity is large, I choose the supplier through bidding. If the quantity is small, I usually introduce a good supplier through word of mouth, and we will do the maintenance ourselves. Beijing Feifanshi Technology Co., Ltd. has good access control products and is our only qualified supplier at present. Because I'm still working, it's not convenient to say the name of the company. After all, people in state-owned enterprises understand.