woocommerce-paypal-payments/modules/ppcp-settings/resources/js/switchSettingsUi.js

document.addEventListener('DOMContentLoaded', () => {
    const config = ppcpSwitchSettingsUi;
    const button = document.querySelector('.button.button-settings-switch-ui');

    if ( ! typeof config || !button) {
        return;
    }

    button.addEventListener('click', () => {
        fetch(config.endpoint, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            },
            body: JSON.stringify({
                nonce: config.nonce,
            }),
        })
            .then((response) => {
                if (!response.ok) {
                    throw new Error('Network response was not ok');
                }
                return response.json();
            })
            .then((data) => {
                window.location.reload();
            })
            .catch((error) => {
                console.error('Error:', error);
            });
    });
});