http-functions.js

import {ok, created, serverError, response} from 'wix-http-functions';
import {capturePayment} from 'backend/payPal.jsw';
import wixData from 'wix-data';

export function post_payPal(request) {
   let options = {
    "headers": {
        "Content-Type": "application/json"
        }
    };
    return request.body.json()
    .then( (body) => {
        if(body.event_type === "CHECKOUT.ORDER.APPROVED") {
            payUser(body);
        } else {            
            console.log(body);
        }
    })
    .then( () => {
        options.body = {
            "status": 200
        };
        return created(options);
    })
    .catch( (error) => {
        options.body = {
            "error": error
        };
        return serverError(options);
    });
}

function payUser(body) {
    var array = body.resource.links;
	var newArray = array.filter(function (el) {
  		return el.rel === "capture";
	});
    let url = newArray[0].href;
    capturePayment(url)
    .then( (res) => {
        if(res.status) {
            if(res.status === 'COMPLETED') {
                let amount = body.resource.purchase_units[0].amount.value;
                let name = body.resource.purchase_units[0].description;
                let rid = body.resource.id;
                let data = {
                    title: 'DONE',
                    name: name,
                    amount: Number(amount),
                    resourceId: rid
                };
                wixData.insert('payments', data);
            } else {
                //handle failure
            }
        } else {
            //handle failure
        }
    });
}