How to pass key value pair from iFrame parent into Qaultrics?

Hi jaemaz,
I'm not an expert in this area but I think you are going to struggle to retrieve any data outside of the iframe. The survey can't really "see" anything outside of its own scope - the only reason it can get the parent URL is because it is passed in (as document.referrer).
For starters I think you'll need to define the problem with some more info. eg: Where is the key value pair coming from? Is it being stored in in a data attribute? Is it an endpoint from an AJAX call?
Good luck!

Thanks for the response bgooldfed --
I'm looking to get the key-value pair from a string at the end of the parent URL itself (UTMs). (Such as https://mydomain.com/?Mode=1)
In poking around a bit more, it looks like I would have to bridge the gap between the parent site and the iframe since they are on different domains. I've read about inserting JS on the parent page and inside the iframe to pass the information into the iframe via a POST request, I'm just not fluent enough in JS to pull it off, and I'm hoping there is a simpler solution.

Is the UTM being captured when you are getting the parent URL? If so you could split it:var parentUrl = (parent != window) ? document.referrer : ""; //"https://mydomain.com/?Mode=1)

//find where the key-value pair starts
var index = parentUrl.indexOf("?") + 1; // 22
//store the key-value pair on its own
var utm = parentUrl.substring(index); // Mode=1
//split the values
var kv = utm.split("=") // ["Mode","1"]

Qualtrics.SurveyEngine.setEmbeddedData("parentUrl", parentUrl);
Qualtrics.SurveyEngine.setEmbeddedData("keyValue", kv);
I'm assuming you'll only have one key-value pair, if you have more you'll need to have a second split to separate each pair and a way of setting each pair separately in the embedded data.

If the UTM isn't being captured when you get the parent URL however, I can't think of any method other than a POST request (assuming you have control of the parent page). It may seem daunting at first but there are tons of good tutorials out there - once you get the hang of it it's a cinch :)
Good luck!