eventespresso / event-espresso-core

		$step = ! $cart instanceof EE_Cart ? 'ticket' : 'questions';

		//if doing ajax then we need to verify the nonce

		if ( defined( 'DOING_AJAX' ) ) {

			$nonce = isset( $this->_req_data[$this->_req_nonce] ) ? sanitize_text_field( $this->_req_data[$this->_req_nonce] ) : '';

			$this->_verify_nonce( $nonce, $this->_req_nonce );

		}

		switch ( $step ) {

		$nonce_check = isset( $this->_route_config['require_nonce'] ) ? $this->_route_config['require_nonce'] : TRUE;

		if ( $this->_req_action != 'default' && $nonce_check ) {

			// set nonce from post data

			$nonce = isset($this->_req_data[ $this->_req_nonce  ]) ? sanitize_text_field( $this->_req_data[ $this->_req_nonce  ] ) : '';

			$this->_verify_nonce( $nonce, $this->_req_nonce );

		}

		//set the nav_tabs array but ONLY if this is  UI_request

		if ( $this->_is_UI_request )

			$this->_set_nav_tabs();