Is there a canonical list of travel industry payment card codes (VI, MC, AX, etc…)?

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For hotel bookings, hotels provide a list of accepted payment cards to the GDS under GuaranteesAccepted. Common ones are "AX" – American Express, "VI" – Visa, etc.

I want to make sure our application has covered all the bases. Does anyone know of an industry-standard list of these two-character payment card codes?

I’ve checked the OTA docs as well as developer docs for Sabre and Amadeus — no dice. I’ve also run hotel searches and tried to aggregate the codes I’ve found from those responses, but it seems like there should be a complete list somewhere. Or is this something that’s purely a convention?