Custom extension (node) Set or change .env variable module

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Best practice to store api keys

Hi, Its the first time i have used a external api. I am using a external api that has a clientid(never changes), apikey(need to be changed every 90 days), email(never changes) and bearer token (changes every 30 mins). To get a bearer token and api key change this can be done by the api. I'm currently storing them in environment variables. Is this best practice? Can i update the environment variables without changing them in the settings tab? Should i be saving them somewere else. Projects on…