Passing Known Lead/Person From Our Website to "Supplemental" Form on Marketo LP

Question

I feel like I've read 30+ posts/topics and still can't seem to figure this one out.

Goal Path/Outcome:

Person registers for our Sprint program via our 4-5 step PHP web app.
At Step 2, we PushLead update via REST API with First Name, Last Name and Email Address
We get back Marketo ID in API response and store in app code
At final registration step we PushLead update with several Custom Fields we've collected
Person arrives at Registration Complete/Confirmation page, still on LoveMyCreditUnion.org
To enter them into a new sweepstakes, I need 2 more fields from them so we'll link them to a Marketo-hosted LP with the additional fields (Postal Code and a Accept Terms boolean check-box)

What do I need to append to the URL that links them from Registration Complete page on our web app to the Marketo LP to make sure that Marketo Form submission on that LP is stitched/appended to their record?

I've tried appending Base64 encoded ?email= in a URL parameters string with hidden email field on the form and that's not working.

Is the only solution to do an associateLead call to the Javascript API while they're moving through my web app and we know their email address? Can we query the REST API for a mkt_tok to append to the URL that takes them to the Marketo LP? I'm worried I'll have LP/Form submissions in my DB with only Postal Code and Check Box Boolean and none of the other data we just collected in our web app properly joined in Marketo DB.

SanfordWhiteman · Accepted Answer

I've tried appending Base64 encoded ?email= in a URL parameters string with hidden email field on the form and that's not working.

A URL param will work fine, but it can't be Base64-encoded because Marketo will simply use the Base64-encoded value! There's no awareness that the string should be treated in any special way.

You can transform the hidden field after it's populated:

MktoForms2.whenReady(function(form){
  var currentValues = form.getValues();
  form.setValues({
    Email : atob(currentValues.Email)
  });
});

There are some other optimizations I would probably do to your workflow but if your concern is how to pass in an obfuscated hidden field, this is how.

Jeremy_Caverly · Answer

*fingers crossed* "San the Man" @Sanford Whiteman​ happens across this one.

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