Re: [browser-payment-api] Different card schemes have different mandatory field requirements (#9)

> Adrian, I've dug deeper and found the following: Whilst Maestro is still a brand, Maestro cards that need issue number or start date to be submitted were actually using the Switch network scheme (even though the brand was Maestro), this network was closed in 2011, this effectively means that these card went out of circulation sometime in 2014.

That matches the results of the research we've been doing too.

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