Integrating Authorize Net Payment Gateway into a MERN Stack Application

I am looking for help on a project I am working on for a local business. I need to integrate Authorize Net to accept credit card payments. I would also like the Paginate code to be refactored so it will work correctly, when I added to the homepage a collection selection, it broke. This app is built with the MERN stack, using redux for state management. I would also like the code to be reviewed and additional feedback would be appreciated if other issues.