function llms_confirm_payment_url( $order_key = null ) {

	$args = array();

	if ( $order_key ) {
		$args['order'] = $order_key;
	}

	$redirect = llms_filter_input( INPUT_GET, 'redirect', FILTER_VALIDATE_URL );
	if ( $redirect ) {
		$args['redirect'] = rawurlencode( urldecode( $redirect ) );
	}

	$url = llms_get_endpoint_url( 'confirm-payment', '', get_permalink( llms_get_page_id( 'checkout' ) ) );
	if ( $args ) {
		$url = add_query_arg( $args, $url );
	}

	/**
	 * Filter the checkout confirmation URL.
	 *
	 * @since 1.0.0
	 *
	 * @param string $url URL to the payment confirmation screen.
	 */
	return apply_filters( 'lifterlms_checkout_confirm_payment_url', $url );

}