woocommerce-paypal-payments/modules/ppcp-blocks/resources/js/Components/checkout-handler.js

import {useEffect} from '@wordpress/element';
import {usePayPalCardFields} from "@paypal/react-paypal-js";

export const CheckoutHandler = ({getCardFieldsForm, getSavePayment, hasSubscriptionProducts, saveCardText, is_vaulting_enabled}) => {
    const {cardFieldsForm} = usePayPalCardFields();

    useEffect(() => {
        getCardFieldsForm(cardFieldsForm)
    }, []);

    if (!is_vaulting_enabled) {
        return null;
    }

    return (
        <>
            <input
                type="checkbox"
                id="save"
                name="save"
                onChange={(e) => getSavePayment(e.target.checked)}
                defaultChecked={hasSubscriptionProducts}
                disabled={hasSubscriptionProducts}
            />
            <label htmlFor="save">{saveCardText}</label>
        </>
    )
}