Maybe I missed this somewhere but I want a user to be able to enter their lead ID (it will be mailed to them as an 'activation code') and then when they submit I'll have that inserted into the API and prefill the form with their lead data. Does Marketo have that prebuilt into it somewhere?
Basically they receive a direct mail piece with this activation code (their lead ID) and a landing page URL. They go to the page and its basically just a form with a text input and submit button, they enter their code/lead ID and hit enter. Then I have it grab the lead ID that is entered and it directs them to a multi step form and uses the API to prefill all the lead data we have for them, they fill out the rest and submit. If they come back and enter the code/ID again it prefills with all the previously submitted info (presumably by including all the fields in the query, so if we have it it prefills, if we don't its blank).