Hey - first of all, congratulations. This course was created to bridge the older L1 and L2 certifications to the new UX, meaning, those that already took L1 and L2 with Classic could simply take this course and avoid having to completely retaking the certification.
There isn't an paper certification for this course but you should see a badge within 5-10 business days. If you don't see the badge, send a note to firstname.lastname@example.org with any screenshots showing you completed the course. They'll get you that badge right quick.