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One company asks for picture of my debit card
Although it is strange, there is little risk. The first four numbers are just the card type (Visa, Master, etc.), and the last four alone don't give them much - there are still 8 digits missing that they do not have. There is nothing much they can do with that info, especially without the PIN and the CCV, so as I said, little risk. Maybe they are using this to verify that you are the right person - you probably used that card originally to put money in for the gaming. That would be a way for them to authenticate you.