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A comment on Brazil's Pix Payment System Faces Pressure from Visa and Mastercard. Parent comment
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A CPF is nationally unique.
You also have a RG/RNE which is unique per state. Not too often you get asked for this one though.
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A CPF is nationally unique.
You also have a RG/RNE which is unique per state. Not too often you get asked for this one though.