Next.js - Help to hide API key from Next.js APP

Hello, I bought this template: [login to view URL] In this landing page: [login to view URL] there is a subscribe form. This subscribe form has to be connected with MailerLite I want to use this Library with Node.js: [login to view URL] If I use this library in a [login to view URL] component, it works fine, but the API key is visible in the browser. I want the communication to happen in Node.js (backend), so that the API key will be invisible in the browser.' I need help in making this library function in my current repository, with Node.js. What is needed: 1) You'll have to create an account with MailerLite to test it, or somthing else 2) I will give you access to my Repo in GitHub 3) You will make the changes and send a Pull Request 4) If I will have questions or need for explanation what happens, you will explain me This mini-task is done if: The API key will be invisible in the browser, in XHR communication and in .js files, anywhere. If it can work on Vercel or Netlify even better, but if a server needs to run, so probably it will not work there.