Is it possible to create post in wordpress using postman?

Thank you for your questions.

Did you check: https://make.wordpress.org/core/2020/11/05/application-passwords-integration-guide/ ?

From WordPress 5.6 you can set application password in your WordPress profile.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)