Can we write extra Data?

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Can we write extra data to the magstripe?
like say example " +$150 "

I seen a youtube video where a guy took a gamestop gift card that had $0.00 on it and he added some code to it I don't remember the code but he added 150 to it and went to a gamestop place and asked to check the card and it said it had $150.00 on it could we maybe do the same on a CC?

I'll try N link the vid
 
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