looking for an answer in removing credit card details in purchasing gems in clash of clans

thonydrei

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Apr 9, 2015
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after purchasing gems in clash of clans via credit card in which the information is also saved within, and if another transaction will be done in the future, a password on your google account will be ask.

question, is this safe or is there any other way to remove the credit card details that has been saved or changing of password in Gmail will do to solve this problem?