If you set the landing page “Thank-you page” to direct to the orderform url, the process would play out a little like this:
Contact would enter info into the landing page, and hit the submit button,
The landing page submit button redirects instantly to the orderform / checkout URL that you set up.
Customer checks out, and submits payment.
Orderform redirects to the order-form’s thankyou page (Which much like the landing page, can either be an Infusionsoft Thank-you page, or a URL that you want to redirect the customer too *sometimes customers create custom thank-you pages, hidden on their website.)