If you need to pay in US CURRENCY [“CASH”] because you don’t have a bank account, this resource may be helpful. the IRS, California FTB, California CDFTA or EDD, this is a resource that provides all of the tools.
In addition, it contains background on filing Form 8300 - IRS SAR which is the report required to be filed when you receive more than $10,000 in a commercial transaction.