src/Core/ServiceContext.php
public function updateOAuth2Token($OAuth2AccessToken){
      if($OAuth2AccessToken instanceof OAuth2AccessToken && $this->requestValidator instanceof OAuth2AccessToken){
        $this->IppConfiguration->Security = $OAuth2AccessToken;
        $this->requestValidator = $OAuth2AccessToken;
      }

    }
public function updateOAuth2Token($OAuth2AccessToken){
      if($OAuth2AccessToken instanceof OAuth2AccessToken && $this->requestValidator instanceof OAuth2AccessToken){
        $this->IppConfiguration->Security = $OAuth2AccessToken;
        $this->requestValidator = $OAuth2AccessToken;
      }

    }
Update OAuth 2 Access Token with the new Token Value
@param OAuth2AccessToken  The OAuth 2 token that contains access token, refresh token