There are tax risks for domestic Company B, because the money transferred to your account can be regarded as an income. Transferring other people’s money through B is not standardized, according to the transaction relationship I don’t know, and what is the purpose of the money transferred from Company B to Company C? If the purchase payment is based on a purchase invoice, what is the original document for transferring the payment? Similarly, for foreign company A, the transaction relationship is unclear. Company C also has insufficient basis for collecting payment. If it uses a cashier's check or money order, it can also collect payment through endorsement transfer.