@atd implementation is based on FDX standard - https://financialdataexchange.org/
Speficially, I’ve implemented subset defined by Plaid.com from here: https://plaid.com/core-exchange/docs/
But it does seem like standard is dead as far as worldwide adoption goes. I’m planning to remove Bank Feed Providers feature and bank feeds will be facilitated by Manager extensions which is more flexible and simpler approach.