This is not permissible as you are helping the salesman and collaborating with them on promoting credit cards

There is a job where i need to make to pretend to be a customer and report on how a sales person is selling a credit card. i do not sign up for the credit card. i have a doubt that it may be haram because i am involved in the credit card somehow. please advise if such job is permissible or should i stay away.

Jobs | October 16, 2017 3:15 am
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Sir please is it permisible for a muslim brother to work at a commercial bank? Because i’ve heard so many speculations from different scholars in Nigeria that it is haram, because the banks pays their staffs with money which is not halal money, sir please i really need a proper clarification on that.
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Actually I run a business of railway/air tickets and sometimes customer ask me to book tickets for dargah like Ajmer/Nizamuddin or other related to them. So,it is permissible for me to book tickets for such places.