Automatically copying Basecamp tasks assigned to me to Omnifocus?

Hi all, does anyone know how I might go about automating this process? I’d rather not use services like Zapier since they have limited uses before they start charging.

If it matters, I manage the Basecamp account and do have full access to the settings in Basecamp.

I assume this will work. (More generally, the Bascamp->OF zaps are here.)

Thanks, but I’m trying to avoid Zapier.