WooCommerce: Redirect the customer to your own thank you page (one for successful payments and one for all other statuses)

bedankpagina.php

<?php
add_action( 'woocommerce_thankyou', 'fw_redirect_custom_thank_you_page');
function fw_redirect_custom_thank_you_page( $order_id ){
    $order = wc_get_order( $order_id );
    $url = home_url('/YOUR_THANK_YOU_PAGE/'); // <<< change this slug 
    if ( $order->has_status( array('processing', 'completed' ) ) ) {
        wp_safe_redirect( $url );
        exit;
    }
}

Place this code into the functions.php file from your WordPress child theme