sell photos online

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i am registering to shutterstock.com and they are asking for my ID, does anyone know here if shutterstock is legit and is it secure to give IDs to them? i would like to sell photos and art works online to earn extra money, they say its easy to sell, its my first time to join that kind of selling thats why i don't have any idea...i was just surprised that shutterstock is asking to upload IDs....i'm not sure if its ok thats why i need some feedback regarding this.. your opinions are really appreciated