Two payments? Odd. You didn't sell an article to someone else? I've received a mystery payment which I eventually put down to a calendar company who I sent one of my pics.

Anyway, don't send the money back if someone says it was sent in error. Here is why. It could be a mistake that your bank haven't cottoned onto yet. https://medium.com/midform/dont-fall-for-this-scam-see-your-cash-disappear-d3d6b81e3cea

You don't get a second payment for being boosted by the way.