public function recurring_charge( $order_id ) {

		// Make sure the order still exists.
		$order = llms_get_post( $order_id );
		if ( ! $order || ! is_a( $order, 'LLMS_Order' ) ) {

			/**
			 * Fired when a LifterLMS order's recurring charge errors because the order doesn't exist anymore
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_order_error', $order_id, $this );
			llms_log( sprintf( 'Recurring charge for Order #%d could not be processed because the order no longer exists.', $order_id ), 'recurring-payments' );
			return false;

		}

		// Check the user still exists.
		$user_id = $order->get( 'user_id' );
		if ( ! get_user_by( 'id', $user_id ) ) {

			/**
			 * Fired when a LifterLMS order's recurring charge errors because the user who placed the order doesn't exist anymore
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param int                    $user_id    WP User ID of the user who placed the order.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_user_error', $order_id, $user_id, $this );
			llms_log( sprintf( 'Recurring charge for Order #%1$d could not be processed because the user (#%2$d) no longer exists.', $order_id, $user_id ), 'recurring-payments' );

			// Translators: %d = The deleted user's ID.
			$order->add_note( sprintf( __( 'Recurring charge skipped. The user (#%d) no longer exists.', 'lifterlms' ), $user_id ) );
			return false;

		}

		// Ensure Gateway is still available.
		$gateway = $order->get_gateway();

		if ( is_wp_error( $gateway ) ) {
			/**
			 * Fired when a LifterLMS order's recurring charge errors because of a gateway error. E.g. it's not available anymore.
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param WP_Error               $error      WP_Error instance.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_gateway_error', $order_id, $gateway, $this );

			llms_log(
				sprintf(
					'Recurring charge for Order #%1$d could not be processed because the "%2$s" gateway is no longer available. Gateway Error: %3$s',
					$order_id,
					$order->get( 'payment_gateway' ),
					$gateway->get_error_message()
				),
				'recurring-payments'
			);

			$order->add_note(
				sprintf(
					// Translators: %s = error message encountered while loading the gateway.
					__( 'Recurring charge was not processed due to an error encountered while loading the payment gateway: %s.', 'lifterlms' ),
					$gateway->get_error_message()
				)
			);
			return false;

		}

		// Gateway doesn't support recurring payments.
		if ( ! $gateway->supports( 'recurring_payments' ) ) {

			/**
			 * Fired when a LifterLMS order's recurring charge errors because the selected gateway doesn't support recurring payments.
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param LLMS_Payment_Gateway   $gateway    LLMS_Payment_Gateway extending class instance.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_gateway_payments_disabled', $order_id, $gateway, $this );
			llms_log(
				sprintf(
					'Recurring charge for order #%d could not be processed because the gateway no longer supports recurring payments.',
					$order_id
				),
				'recurring-payments'
			);

			$order->add_note( __( 'Recurring charge skipped because recurring payments are disabled for the payment gateway.', 'lifterlms' ) );
			return false;

		}

		// Recurring payments disabled as a site feature when in staging mode.
		if ( ! LLMS_Site::get_feature( 'recurring_payments' ) ) {

			/**
			 * Fired when a LifterLMS order's recurring charge errors because the recurring payments site feature is disabled.
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param LLMS_Payment_Gateway   $gateway    LLMS_Payment_Gateway extending class instance.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_skipped', $order_id, $gateway, $this );
			$order->add_note( __( 'Recurring charge skipped because recurring payments are disabled in staging mode.', 'lifterlms' ) );
			return false;

		}

		// Related product removed.
		if ( empty( $order->get_product() ) ) {

			/**
			 * Fired when a LifterLMS order's recurring charge errors because the purchased product (Course/Membership) doesn't exist anymore.
			 *
			 * @since Unknown
			 *
			 * @param int                    $order_id   WP Post ID of the order.
			 * @param LLMS_Controller_Orders $controller This controller's instance.
			 */
			do_action( 'llms_order_recurring_charge_aborted_product_deleted', $order_id, $this );
			llms_log(
				sprintf(
					'Recurring charge for order #%d could not be processed because the product #%d does not exist anymore.',
					$order_id,
					$order->get( 'product_id' )
				),
				'recurring-payments'
			);

			$order->add_note( __( 'Recurring charge aborted because the purchased product does not exist anymore.', 'lifterlms' ) );
			return false;

		}

		// Passed validation, hand off to the gateway.
		$gateway->handle_recurring_transaction( $order );
		return true;

	}