[Zapier Integration] What to put in redirect uri (OAuth)?

Hi we are stuck at sending requests to ERPNext

What happened (You are seeing this because you are an admin):
  Starting POST request to http://c1e6dd81.ngrok.io/api/resource/Sales Invoice
  Received 417 code from http://c1e6dd81.ngrok.io/api/resource/Sales Invoice after 1821ms
  Received content "<!DOCTYPE html>
<!-- Built on Frappe. https://frappe.io/ -->
<html lang="en">
<head>
	<meta charset="
  Unexpected token < in JSON at position 0

Console logs:

Stack trace:
  Object.parse (native)
  Object.promise.then (/var/task/creates/create_invoice.js:56:46)
  bound (domain.js:280:14)
  Object.runBound (domain.js:293:12)
  Object.tryCatcher (/var/task/node_modules/bluebird/js/release/util.js:16:23)
  Promise._settlePromiseFromHandler (/var/task/node_modules/bluebird/js/release/promise.js:512:31)
  Promise._settlePromise (/var/task/node_modules/bluebird/js/release/promise.js:569:18)
  Promise._settlePromise0 (/var/task/node_modules/bluebird/js/release/promise.js:614:10)
  Promise._settlePromises (/var/task/node_modules/bluebird/js/release/promise.js:693:18)
  Async._drainQueue (/var/task/node_modules/bluebird/js/release/async.js:133:16)
  Async._drainQueues (/var/task/node_modules/bluebird/js/release/async.js:143:10)
  Immediate.Async.drainQueues (/var/task/node_modules/bluebird/js/release/async.js:17:14)
  runCallback (timers.js:672:20)
  tryOnImmediate (timers.js:645:5)
  processImmediate [as _immediateCallback] (timers.js:617:5)

Has anyone tried logging/displaying the JSON that is being sent?

Have you tried this? Found this based on the 417 error code.

Hello! I’ll be moving this conversation here Zapier integration with ERPNext - #29 by johnskywalker. Since this (the OAuth) is already solve.