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I wonder if under the hood they are somehow using digital prepaid cards and building on the solid foundation they already had? Looks like could be a deeper integration with RappiPay.
Taken from their previous FAQ:
Additionally, if you're in a location that accepts RappiPay (eg, Colombia, Argentina, Brazil, Chile, Costa Rica, Ecuador, Mexico, Peru, and Uruguay) then you should try that wallet, as most users report success with it.