you can do a reversal request via fedwire, but you also need to reach out to the receiving bank, tell them what occurred, send them a letter of indemnification if there are funds in the account so they can return to you. Chances are if it was done fraudulently the funds are gone and your customer has no chance of getting back. Educating your customer on finality of wire payments is an ongoing process, not something they are likely to want to hear about at this point.
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