It is possible for me to get accessToken and refreshToken of a user using sdk or api ?

Yes, you can retrieve the accessToken and refreshToken by fetching the connection details. This feature is disabled by default for security reasons, but you can enable it from [project settings](https://platform.composio.dev?next_page=/settings/configuration). However, we generally don't recommend enabling it since these tokens are sensitive

Can you also point me to the documentation where I can see how to do this ?

here's the API ref: https://docs.composio.dev/api-reference/connected-accounts/get-connected-accounts-by-nanoid