What do pu and Pb mean in car phone invitation?

Pu and pb may be abbreviations for platform upgrade and brand promotion. These terms are usually used to describe the work of an automobile brand or sales platform to upgrade, improve and improve the service quality in order to attract more consumers. Car rental refers to a sales strategy in which salespeople invite potential customers or existing customers to the store or test drive by telephone, SMS, email, etc. Promote car sales.