IIRC implanting flexies in the blade of the hand is not recommended as it could lead to premature failures:
Cash is still very common in the third world, or at least in my region… Sure, credit and debit cards are rather common around here but I’m somewhat old fashioned, this is why I’d rather wait for Amal to convince Mastercard to support the Apex. After all, I wouldn’t use a payment conversion often enough to justify cutting my skin. But having the option as an additional feature in a chip that I’m bound to end up using every day would be nice. And if it never gets supported it doesn’t matter.