Verify the account, and do some legitimate check if it's really an legitimate seller or a scam. I've been to online reselling before, And I did these, so far until I stopped, I was never scammed. And one more thing, you are in business, in business there's lose, there's also prospering, so you really need to gamble, you'll never know if you are a good seller if you'll never gamble. And trusting is gambling, so part of being a seller is to trust your supplier. If he/she scammes you, accept it, that's part of business, but if he/she give you your merchandize in exchange with the money you gave them, that's much better.