I think a sole proprietorship enterprise can accept foreign exchange. Because foreign exchange trading companies also have individual proprietorships.

And ordinary cards don't work. You must open a dual-currency card. If it is accepted, a certificate of origin may be required if it exceeds $2,000, and the amount of foreign exchange settlement in one year cannot exceed $50,000.

Individuals who purchase foreign exchange with the equivalent of less than $50,000 within one year can go directly to the bank with their valid identity documents. If it exceeds the limit, in addition to the valid personal identity documents, it is necessary to go to the designated foreign exchange bank to handle the relevant certification materials that need to be paid.