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For affinity cards from this company (UMB/Cardpartner) it's typically 0.3%.

Source: https://www.owasp.org/images/0/08/CardPartner_Kit.pdf

0.3%?! It'd far more effective to get a 2% cash back rewards card like the Double Cash, and donate the money to the Linux Foundation.

Only if you actually remember to donate your rewards balance. Effortless transactions are powerful.

Depending on your payroll provider, you may be able to automate this. (Gusto used to make this easy, though they recently changed it so that each charity has to be signed up with their backend provider. Not sure about other payroll platforms.)

https://www.charitynavigator.org/index.cfm?bay=search.profil...

awesome, great sleuthing!

I'm curious what kind of return the linux foundation can get from this, out in the world.

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