*/
	protected function handle_webhook_upsert() {

		$data = array(
			'name'         => llms_filter_input_sanitize_string( INPUT_POST, 'llms_rest_webhook_name' ),
			'status'       => llms_filter_input_sanitize_string( INPUT_POST, 'llms_rest_webhook_status' ),
			'topic'        => llms_filter_input_sanitize_string( INPUT_POST, 'llms_rest_webhook_topic' ),
			'delivery_url' => llms_filter_input( INPUT_POST, 'llms_rest_webhook_delivery_url', FILTER_SANITIZE_URL ),
			'secret'       => llms_filter_input_sanitize_string( INPUT_POST, 'llms_rest_webhook_secret' ),
		);

		if ( 'action' === $data['topic'] ) {
			$data['topic'] .= '.' . llms_filter_input_sanitize_string( INPUT_POST, 'llms_rest_webhook_action' );
		}

		$hook_id = llms_filter_input( INPUT_POST, 'llms_rest_webhook_id', FILTER_SANITIZE_NUMBER_INT );

		if ( ! $hook_id ) {

			$hook = LLMS_REST_API()->webhooks()->create( $data );
			if ( ! is_wp_error( $hook ) ) {
				return llms_redirect_and_exit( $hook->get_edit_link(), array( 'status' => 301 ) );
			}
		} else {

			$hook = LLMS_REST_API()->webhooks()->get( $hook_id );
			if ( ! $hook ) {

				// Translators: %s = Webhook ID.
				$hook = new WP_Error( 'llms_rest_api_webhook_not_found', sprintf( __( '"%s" is not a valid Webhook.', 'lifterlms' ), $hook_id ) );

			} else {

				$data['id'] = $hook_id;
				$hook       = LLMS_REST_API()->webhooks()->update( $data );

			}
		}

		if ( is_wp_error( $hook ) ) {
			// Translators: %1$s = error message; %2$s = error code.
			LLMS_Admin_Notices::flash_notice( sprintf( __( 'Error: %1$s [Code: %2$s]', 'lifterlms' ), $hook->get_error_message(), $hook->get_error_code() ), 'error' );
			return $hook;
		}

		return true;