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when you get cash from a credit card used by any APP or ATM is called a credit card cash withdrawal
jus by using a credit card issuer bank 
yes, you can take cash on credit card 
the documents required to apply for a loan against a credit card in Bengaluru are id proof and residence proof
you can apply for a loan against a credit card in Bengaluru by calling customer care of the bank issuing a credit card.