OptimizePress is one of the first page builder plugins for WordPress. It’s more marketed to internet marketers, but can be used for all sorts of purposes.
There are currently no active OptimizePress Coupon or OptimizePress Discounts available.
Right now I wouldn’t recommend using OptimizePress because it is old and outdated. If you are wanting to create landing pages you would be better off using Thrive Leads or Elementor.
Also, the included membership plugin is essentially a fork of S2 Member.