User login in php

When im first trying to login the registered user error is not valid user token please relogin and when i am relogging in there’s an error as invalid username or password.But username and password are registered and legit.

Hello Jack!

Are you trying to login registered user by entering his username or email? The problem might be in users’ identity value (see https://backendless.com/documentation/users/rest/users_user_properties.htm). Email is set as user’s identity by default, so when logging in a user you should use his email and password or change identity in Users > User properties section.

Best regards
Anton