Please help

SoI'm paying for accommodation for a friend of mine and the hotel he's staying at IBIS Sydney hotel asked for a picture of my VISA Debit card (front & back) together with the name of my friend whom I'm paying for and check in/out details but why would they need the back pic of my VISA card which has the pin!!! So I've just sent them a reply with just my Debit card's front pic cause I really want my friend to have a place to stay for the night but do you think they could drain my account or sth without my PIN code?


MANY THANKS FOR YOUR THOUGHTS