I have the following use case: I'm sending an email through Marketo to several leads. A link in the email will point them to one of the pages on my website. When they get to the page I will use the Marketo API to prefill a form with their information (or simply verify that they clicked the link) and then once they're identified provide them with a download link. How can I pass lead information from the email to the website (assuming a new browser session without cookies or anything like that). It looks like using mkto_tok is the wrong approach from what I've researched so far.
Additional information: We're using the Marketo API and our own HTML forms so we have more freedom over how they're built.