Send Post request in Node js Rest API

Question

FROM THE CLIENT SIDE, I CAN'T SEND A POST REQUEST!

I must use the Node js Rest API to deliver an HTTP Post request to the payment gateway. Headers and a body payload are required for a post request. I use a Rest API with Express.js and have my frontend and backend separated. Since the payment gateway requires server-to-server connection, I am unable to implement that from the client side. Basically, I have to call my backend server when a user hits the "Payment" button, and then my backend server has to make a request to the payment gateway.

The only MVC (Model View Controller) documentation available for payment gateways is not very helpful.

Consequently, the controller's logic should look like this.

exports.payment = (req, res, next) => {
   const { amount, id, currency } = req.body;

   //add headers
   //create body paloyad

   //send request to https://payment....com/api-key/transaction

   //receive response

   res.status(200).json({ status: 'success' });
}