OneTrust Consent Manager integration by tag: https://docs.google.com/document/d/1r3Ie3i_hBQh1WAiVUVA2f1NqegQLDWMY6tuOMZRi88A

OneTrust_Int.js

;(function(u){
  
    /**
      * @desc Map your OneTrust tag IDs here to Tealium Template IDs found in utag.loader.cfg object like this:
      * @param "OneTrust_tag_id": "Tealium_tid",
      * @return You can add more lines to suit your tag library in both tools
    */ 
    // Begin Config
    var oneTrustTagIdToTealiumTemplateIdConfig = {
       "81878": "7110", // e.g.: Google Analytics
       "81879": "19004", // e.g.: Adobe Analytics
       "81876": "2011", // e.g.: BlueKai
       "106": "13099" // e.g.: Maxymiser
    };
    // End Config
    
    /**
      * @desc allows only the OneTrust Consent Manager tag to load, set all other tags to no-load
      * @param object u - the utag object
      * @return - no return value 
    */
    var resetLoader = function(u){
      for(var uid in u.loader.cfg) {
          if(uid !== '18') {
            u.loader.cfg[uid].load = 0;
          }
      }
    };
    
    /**
      * @desc listener for custom event triggered by OneTrust consent change
      * @param object element, string event, function callback - HTML DOM element, custom event name and the handler function
      * @return - no return value 
    */
    var addListener = function(element, event, callback) {
        if(element.addEventListener) {
            element.addEventListener(event, callback, false);
        } 
        else if(element.attachEvent) {
            element.attachEvent('on' + event, callback);
        }
    };
    
    /**
      * @desc get cookie function
      * @param string cookie_name - name of the cookie
      * @return string cookie value - return cookie value or empty string if no cookie found
    */
    var getCookie = function(cookie_name) {
      var name = cookie_name + "=";
      var decodedCookie = decodeURIComponent(document.cookie);
      var ca = decodedCookie.split(';');
      for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) === ' ') {
          c = c.substring(1);
        }
        if (c.indexOf(name) === 0) {
          return c.substring(name.length, c.length);
        }
      }
      return "";
    };
    
    /**
      * @desc extract cookie information from OneTrust cookie and build object with OneTrust tag IDs as keys and 1|0 as value depening on consent given or not
      * @param string cookie_name - name of the cookie
      * @return object groupObj - return object with OneTrust tag IDs as keys and 1|0 as value depening on consent given or not
    */
    var readCookieAndCreateObj = function(cookie_name){
        var groups = "", 
            groupArr = [], 
            cookie = "",
            groupObj = {},
            elem = [];
        cookie = getCookie(cookie_name);
        if(cookie && cookie !== "") {
            cookie = cookie.split('&');
        } else {
            return "";
        }
        for(var i = 0; i < cookie.length; i++) {
          if(/groups/gi.test(cookie[i])) {
            groups = cookie[i].split('=')[1].replace(/0_/g, '');
          }
        }
        groupArr = groups.split(',');
        for(var j = 0; j < groupArr.length; j++) {
          elem = groupArr[j].split(':');
          groupObj[elem[0]] = elem[1];
        }
        return groupObj;
    };

    /**
      * @desc maps the OneTrust tag IDs to Tealium's template IDs (tid) using oneTrustTagIdToTealiumTemplateIdConfig object and enable loading of tags which received consent in OneTrust
      * @param none
      * @return none
    */
    var compareIds = function(){
        var groupObj = readCookieAndCreateObj('OptanonConsent');
        if(groupObj === "") {
            return;
        }
        for(var oneTrustTagId in groupObj) {
            if(groupObj[oneTrustTagId] === '1') {
                for(var key in u.loader.cfg) {
                    if(oneTrustTagIdToTealiumTemplateIdConfig[oneTrustTagId] == u.loader.cfg[key].tid) {
                        u.loader.cfg[key].load = 1;
                    }
                }
            }
        }
    };

    /**
      * @desc custom event handler for consent.onetrust event
      * @param none
      * @return none
    */
    var readCookieAndSetConsentPref = function(){
        resetLoader(u);
        compareIds();
        u.loader.ol = 0;
        u.loader.INIT();
    }; 

    /**
      * @desc init on extension execution during page load, add listener
      * @param none
      * @return none
    */
    resetLoader(u);
    addListener(window, "consent.onetrust", readCookieAndSetConsentPref);
    compareIds();
})(window.utag);