gistfile1.txt

add_filter('woocommerce_paypal_payments_purchase_unit_from_wc_order', function ($purchase_unit, $order) {
    if (!$purchase_unit instanceof \WooCommerce\PayPalCommerce\ApiClient\Entity\PurchaseUnit || !$order instanceof \WC_Order) {
        return $purchase_unit;
    }

    $actual_total = (float)$order->get_total();

    $new_money = new \WooCommerce\PayPalCommerce\ApiClient\Entity\Money(
        $actual_total,
        $order->get_currency()
    );

    $new_amount = new \WooCommerce\PayPalCommerce\ApiClient\Entity\Amount($new_money, null);

    $purchase_unit->set_amount($new_amount);

    return $purchase_unit;
}, 10, 2);

add_filter('ppcp_ditch_items_breakdown', function($ditch, $purchase_unit) {
    if ($purchase_unit instanceof \WooCommerce\PayPalCommerce\ApiClient\Entity\PurchaseUnit) {
        if ($purchase_unit->amount()->breakdown() === null) {
            return true;
        }
    }
    return $ditch;
}, 10, 2);