Restivus sql server authentication

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Hi there.i have to write a webservice in the coming days to expose some routes for a banking app that will create some user after they have paid a certain fee.As im used to meteor id like to stick with it but our server database is MSSQL.I guess if i want to create some routes i shouldnt use publications but instead go for methods(for example some method that will return a promise with sequelize.query).I have no clue how i should handle authentication im thinking of storing the bank username and app password into mongo and check against it and then handle all CRUD directly into the MSSQL but im a bit uncertain.Can you give me some advices and if possible some snippets ?.How to authenticate this banking app?Json tokens?password authentication? im lost man please help me out..