Checkbox Plugin

Guide

https://docs.chatfuel.com/grow/grow-documentation/checkbox-plugin

html code for plugin

<script> window.fbMessengerPlugins = window.fbMessengerPlugins || { init : function() { FB.init({ appId: "1678638095724206", xfbml: true, version: "v3.0" }); }, callable : [] }; window.fbMessengerPlugins.callable.push( function() { var ruuid, fbPluginElements = document.querySelectorAll(".fb-messenger-checkbox[page_id='1589876824360149']"); if (fbPluginElements) { for( i = 0; i < fbPluginElements.length; i++ ) { ruuid = 'cf_' + (new Array(16).join().replace(/(.|$)/g, function(){return ((Math.random()*36)|0).toString(36)[Math.random()<.5?"toString":"toUpperCase"]();})); fbPluginElements[i].setAttribute('user_ref', ruuid) ; fbPluginElements[i].setAttribute('origin', window.location.href); window.confirmOptIn = function() { FB.AppEvents.logEvent('MessengerCheckboxUserConfirmation', null, { app_id:"1678638095724206", page_id:"1589876824360149", ref:"b64:ZnJlZS12aWRlby1jb3Vyc2U=", user_ref: ruuid }); }; } } }); window.fbAsyncInit = window.fbAsyncInit || function() { window.fbMessengerPlugins.callable.forEach( function( item ) { item(); } ); window.fbMessengerPlugins.init(); }; setTimeout( function() { (function(d, s, id){ var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) { return; } js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/en_US/sdk.js"; fjs.parentNode.insertBefore(js, fjs); }(document, 'script', 'facebook-jssdk')); }, 0); </script> <div class="fb-messenger-checkbox" origin="" page_id="1589876824360149" messenger_app_id="1678638095724206" user_ref="" prechecked="true" allow_login="true" size="large"></div>

JS CODE TO SUBSCRIBE A USER

window.confirmOptIn();