Wix IPN Listener

http-functions.js

import {created, serverError, ok} from 'wix-http-functions';
import { fetch } from 'wix-fetch';
import wixCrm from 'wix-crm-backend';
import { parse } from 'querystring';

// HTTP POST - IPN Handler
// Listens for PayPayl's payment notifications and hands off the data to be verified before processing
// Right now, processing == sending a thank you email to the person who paid

export async function post_IPNHandler(request) {
  // get the text of the body, fire off the async func, return 200
  logDebugMessage("In the IPN handler!");

  let text = await request.body.text();
  
  // post_IPNHandler has to return OK before the rest of the requests go through
  // so - set it going asynchronously and return OK
  setTimeout(verifyIPNRequest.bind(null, text), 0);
  
  return ok();
}

// checks back with the IPN service to tell it we're the right folks
// if successful, sends off to processing
async function verifyIPNRequest(request) {
  const isProduction = true;
  logDebugMessage("In verify. Is production: " + isProduction)
  
  const prodFields = {
    url: "https://ipnpb.paypal.com/cgi-bin/webscr",
    email: "youremailhere@whatever.com"
  }

  const testFields = {
    url: "https://ipnpb.sandbox.paypal.com/cgi-bin/webscr",
    email: "seller@paypalsandbox.com"
  }

  var fields = testFields;
  if (isProduction) {
    fields = prodFields;
  }

  logDebugMessage("In verify, right before payload processing")
  
  const payload = "cmd=_notify-validate&" + request;
  const query = parse(request);

  var options = {
    url: fields.url,
    method: 'POST',
    headers: {
        'Connection': 'close',
        'User-Agent': 'WIX-JS-ValidationScript'
    },
    body: payload
  };

  logDebugMessage("about to make the call..." + payload)
    
  var resp = fetch(fields.url, options); 
  
  resp
    .then(r => r.text())
    .then(r => {
      logDebugMessage("We got a response! Response: " + r)

      if (r != 'VERIFIED') {
        logErrorMessage("Donation was not verified. Full data: " + request)
        return;
      }

      if(query.payment_status != 'Completed') {
        logErrorMessage("Donation not completed. Full data: " + request)
        return;
      }

      if(query.receiver_email != fields.email) {
        logErrorMessage("Emails do not match: " + query.receiver_email + " / " + fields.email + ". Full data: " + request )
        return;
      }
    
      const donationData = {
        donor_email: query.payer_email, 
        donor_name: query.first_name, 
        donor_last_name: query.last_name,
        donation_amt: query.mc_gross,
        donation_currency: query.mc_currency, 
        donation_time: query.payment_date
      }
      logDebugMessage("Donation successful: " + JSON.stringify(donationData));
    
      if(isProduction) {
        sendThankYouEmail(donationData.donor_email, donationData.donor_name, donationData.donor_last_name);
      }
    
    })
    .catch(e => {
      console.log("error..." + e);
      logErrorMessage("There was an error parsing response: " + request)
    })
}

function sendThankYouEmail(emailAddr, firstName, lastName) {
  // we're assuming that if the paypal validation goes through that we don't need to worry about auth. 
  const emailId = "RCLPplg";
  
  // don't think Wix is hip to new javascript shorthand stuff
  const contact = {
    firstName: firstName, 
    lastName: lastName,
    emails: [
      emailAddr
    ],
    phones: []
  }
  
   // create the contact, send the email
  wixCrm.createContact(contact)
    .then(contactId => {
      wixCrm.emailContact(emailId, contactId);
    })
    .catch(e => {
      logErrorMessage("Something went wrong sending an email to donator. Error:  " + e + ". Other data: " + request)
    });
}