SuperTokens is an open source authentication solution offering features like: Different types of login: Email / password, Passwordless (OTP or Magic link based).

SuperTokens.com

Hi, how do I specify the supertokens core version for docker image supertokens/supertokens-docker-postgresql?

So for example, if you want version 3.0.X, then you should do `supertokens/supertokens-docker-postgresql:3.0`

Excellent, thank you! Another question: Can I query a supertokens core to tell me what version it is running?

Well. Not the version of the core, but the CDI version it is compatible with, yes

and the CDI version is what matters when we talk about backend SDK and the core's compatibility.