It does create some magnetic fields but they're not strong enough to demagnetize a credit card.

它确实会产生一些磁场，但它们不够强，不足以使信用卡消磁。

Never put a credit card in between your phone and a MagSafe case or it will demagnetize.

切勿将信用卡放在手机和 MagSafe 外壳之间，否则它会消磁。