Terms of paying for factory audit in China or product inspection in China varies from one service provider to another. For instance, there are quality control service providers who will accept online payment, TT, Bank, Western Union, or PayPal. You will discuss this with the quality control service provider. Also, the terms of payments may differ. For example, there are product inspection and factory auditing companies that will require: Full payment of the agreed amount before commencing the inspection process. A certain amount (maybe 35%, 50% or 65% of the total amount), then the remaining amount you pay before they submit the report. This is a common agreement among product inspection and factory auditing service providers in China. Make full payment after completing the auditing, but before submitting the report. Here, just choose an agreement that works for you.