You can pass on the new discount price in a column that acts as old price via the productfeed and the shopitem api. In adition, if you also provide the original price, the discount label and discount percentage are automatically displayed.
At the end of the promotion period you indicate the current price in the same way.
It is not possible to provide an end date in advance. Beslist does not support 2 = 1 promotions, point saving systems or volume discounts.
Recruiting texts such as "promotion" and "discount" are not permitted.