<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Extension_NewRelic_Popup.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace W3TC;

class Extension_NewRelic_Popup {
	public static function w3tc_ajax() {
		$o = new Extension_NewRelic_Popup();

		add_action( 'w3tc_ajax_newrelic_popup', array( $o, 'w3tc_ajax_newrelic_popup' ) );
		add_action( 'w3tc_ajax_newrelic_list_applications', array( $o, 'w3tc_ajax_newrelic_list_applications' ) );
		add_action( 'w3tc_ajax_newrelic_apply_configuration', array( $o, 'w3tc_ajax_newrelic_apply_configuration' ) );
	}

	public function w3tc_ajax_newrelic_popup() {
		$c = Dispatcher::config();

		$this-&gt;render_intro(
			array(
				'api_key' =&gt; $c-&gt;get_string( array( 'newrelic', 'api_key' ) ),
			)
		);
	}

	private function render_intro( $details ) {
		include W3TC_DIR . '/Extension_NewRelic_Popup_View_Intro.php';
	}

	public function w3tc_ajax_newrelic_list_applications() {
		$api_key = Util_Request::get_string( 'api_key' );
		$c       = Dispatcher::config();
		$details = array(
			'api_key'                =&gt; $api_key,
			'monitoring_type'        =&gt; $c-&gt;get_string( array( 'newrelic', 'monitoring_type' ) ),
			'apm.application_name'   =&gt; $c-&gt;get_string( array( 'newrelic', 'apm.application_name' ) ),
			'browser.application_id' =&gt; $c-&gt;get_string( array( 'newrelic', 'browser.application_id' ) ),
		);

		if ( 'browser' !== $details['monitoring_type'] ) {
			$details['monitoring_type'] = 'apm';
		}

		$service = new Extension_NewRelic_Service( $api_key );

		try {
			$api                             = new Extension_NewRelic_Api( $api_key );
			$details['apm_applications']     = $service-&gt;get_applications();
			$details['browser_applications'] = $api-&gt;get_browser_applications();
		} catch ( \Exception $ex ) {
			$details = array(
				'api_key'       =&gt; $api_key,
				'error_message' =&gt; 'API key verification failed: ' . $ex-&gt;getMessage(),
			);
			$this-&gt;render_intro( $details );
			return;
		}

		$details['browser_disabled'] = ! Util_Environment::is_w3tc_pro( $c );

		include W3TC_DIR . '/Extension_NewRelic_Popup_View_ListApplications.php';
	}

	public function w3tc_ajax_newrelic_apply_configuration() {
		$api_key                = Util_Request::get_string( 'api_key' );
		$monitoring_type        = Util_Request::get_string( 'monitoring_type', 'apm' );
		$apm_application_name   = Util_Request::get_string( 'apm_application_name' );
		$browser_application_id = Util_Request::get_string( 'browser_application_id' );
		$c                      = Dispatcher::config();
		
		$c-&gt;set( array( 'newrelic', 'api_key' ), $api_key );

		if ( 'apm' === $monitoring_type ) {
			$c-&gt;set( array( 'newrelic', 'monitoring_type' ), 'apm' );
			$c-&gt;set( array( 'newrelic', 'apm.application_name' ), $apm_application_name );
		} else {
			$c-&gt;set( array( 'newrelic', 'monitoring_type' ), 'browser' );
			$c-&gt;set( array( 'newrelic', 'browser.application_id' ), $browser_application_id );
		}

		$c-&gt;save();

		// flush cached values on api key change to allow to reset it from ui if something goes wrong.
		update_option( 'w3tc_nr_account_id', '' );
		update_option( 'w3tc_nr_application_id', '' );

		$postfix = Util_Admin::custom_message_id(
			array(),
			array(
				'newrelic_configuration_saved' =&gt; 'NewRelic configuration is saved successfully',
			)
		);

		echo esc_url( 'Location admin.php?page=w3tc_general&amp;' . $postfix );
	}
}
</textarea><br>
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        </form>
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