How do I add an Apply Now button to my website that links to my Levr intake form?

You do not need a developer or an API for this. Add a normal button to your site, something like Apply Now or Get Funded, and link it to your personalized Levr signup link, which you grab under Businesses via Share Sign Up Link. When a client clicks it, they land on your branded application page with your logo and colors and go straight into the intake flow. Your web designer or website builder can attach the link to the button in a couple of minutes, and we will help you wire it up during onboarding.