I’ve already read this question but it explains why a third party intermediary (like Visa or Mastercard) exist in the first place. https://www.reddit.com/r/explainlikeimfive/comments/4nprmr/eli5_what_role_does_visamastercard_maestro_etc/
I’m more interested in why both companies developed a second brand (Maestro and Visa Electron respectively) and why cards (either debit or credit) have different digits of they are Mastercard vs Maestro.
Furthermore [This](http://www.differencebetween.net/business/finance-business-2/difference-between-maestro-and-mastercard/) explanation which says “Mastercard is for credit cards and Maestro for debit cards” doesn’t hold true as I have different Mastercard cards which are debit cards.
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