# Constants
ErrEmptyPassword is returned when the password is empty.
ErrEmptyPassword is returned when the username is empty.
ErrInternalServer is returned when the server has an internal error.
ErrInvalidCredentials is returned when the credentials are invalid.
ErrInvalidPayload is returned when the payload is invalid.
ErrUserAlreadyExists is returned when the user already exists.
ErrUserNotFound is returned when the user is not found.
# Interfaces
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