As in HTTP BASIC authentication to specify a hard-coded username and password?
What exactly is not clear?
Uses basic Auth Basic authentication, the username and password are obtained from the database (as in the usual logging in).
If you want "hard" set username\password, it is possible to write your own implementation of basic auth, or just add the rule to .htaccess and put somewhere .htpassword.
This authentication works via e-mail and password in the database.
You need using htpasswd (apache-utils) and nginx to create a standard http basic authorization.
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