WHAT DO YOU THINK ??

[Ahulez]

Do you think It could be possible to modify data / add money / points with Msr Reader/Writer on any magnetic stripe card type ( I'm not talking about any Credit or Debit Card )
I'm talking about:
* Clothing brands fidelity points / gift cards
* Supermarkets fidelity points / gift cards
* Gas Companies fidelity points / gift cards
For example It's possible to re-charge a 100usd "X Clothing Brand Gift Card" with Msr Reader/Writer
Anyone have any experience with these?