"Rep. Payee" is a type of fiduciary that SSA requires for handling SSI benefits and not money from other sources.
If it is a state check that you are looking at, you might want to consult your state laws for the correct fiduciary account to be set up and any other requirements that come with it.
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Opinions are my own.
"I was gratified to be able to answer promptly. I said I don't know." - Mark Twain