You can add a discount to your landing page with the Mariana Tek integration.
If you'd like to add a discount to a selected product, you can select "Yes, Add Discount" and select the relevant discount you have already created in Mariana Tek to apply it to the Landing Page.
In order to add discounts to a landing page the discount will have to be set up as a "Code" discount type, vs an "Automatic" discount. You can learn more about setting up discounts here.
Once you have selected, click Save.