hy everyone !! Please tell me is CMS (wordpress) right option for integration as a 3rd party application ? and is wordpress support auth1.0 authentication ?

Yes. You could use OAuth 1.0 for it if you would want to stick with purely WordPress. Although tray.io and Workato has their own solutions to connect you CMS to NetSuite. If you you really want to purely develop on PHP plugins on your wordpress CMS, you could use this library for OAuth 1.0 https://raw.githubusercontent.com/ChanahC/phpoauth/master/Oauth.php?fbclid=IwAR3PQhhwkCs6eqU0LUE-zBNLvHt_Q9D5d56STMBc-KGjULal8e8HVI3UBpM

Thanx