Submit nodejs request to Sendy to subscribe email address

sendy-subscribe.js

const fetch = (...args) => import('node-fetch').then(({ default: fetch }) => fetch(...args));

module.exports = {
    subscribe: async (emailAddress) => {
        const {
            SENDY_API_KEY: apiKey,
            SENDY_LIST_ID: listId,
            SENDY_SUBSCRIBE_URL: url,
         } = process.env;
         const body = {
            api_key: apiKey,
            email: emailAddress,
            list: listId,
            boolean: 'true',
        };
        const response = await fetch(url, {
            method: "POST",
            body: new URLSearchParams(body), // needed for below Content-Type
            headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
        });
        if (response.status !== 200) throw new Error(`${url} responded with status ${response.status}`);
        const text = await response.text();
        if (text === 'Invalid email address.') throw new Error(`email address invalid: ${emailAddress}`);
        const successTexts = ['Already subscribed.', '1', 'true'];
        if (!successTexts.includes(text)) throw new Error(`${url} responded with text ${text}`);
    }
}