A hug and a kiss for the payment: take whatever they’re offering. But, like Ed says, absolutely — no exception — get a credit on the finished product. And make it contractually clear ( for which you gotta have a contract!) that 1) you own the copyright for the material and that 2) you’re authorizing it for one-time use only at the specified price.
If you’re unclear as to how to write a contract for this, get an attorney to help.
Jack
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