Clever Scam by Digital River

Description

A Serena sent me an email stating that she had accidentally deposited $50 into my PayPal account that she meant to deposit into her friend’s account. She asked me to please return the money. I checked my bank and the $50 showed up but I was locked out of my account. Serena sent me another imploring email. I finally took pity on her and approved her request for the PayPal payment. In doing so, I learned that « Serena » was Digital River and by approving what I thought was a return of her money, I actually had approved a reoccurring payment of $49 to Digital River. I immediately canceled the transaction. I hope it holds.
Has anyone else been drawn into this scheme?