The checkout is elsewhere. Here there is a person.
Want to try before you buy? The free demo build is a free digital product on Zatabox, our payment provider, and runs on your own machine without a licence, in runs that stop after thirty minutes and start fresh. Payment happens off this site, in that same place, the licensed build follows the purchase, and because it downloads at once all sales are final. This page is for everything around that: what to buy, a licence or a device that will not verify, or anything the engine did that you did not expect. It sends your message to one mailbox, and someone who builds the engine reads it.
Write your message
Pick what this is about the subject line follows from it then say what you need. Nothing leaves this tab until you press send.
Direct line
One mailbox, read by the people who build the engine. Write to it straight if the form is in your way.
What happens next
What this page is not
It is not a ticketing system, a chat widget or a form that files you somewhere. Pressing send delivers four things your name, your address, your message and what it is about to one mailbox, along with a random id this browser made up so a flood of submissions can be told apart. There is no account, no profile and no tracking behind the form, and until you press send nothing you type leaves the tab.
Some answers are already written.
If the question is "how do I read X from my own code", the reference probably has it every surface is documented against the engine on your machine.