Go to Setup -> Products -> Add product
Product name -> Billing cycle: 1 Month
Product code -> empty
Product group -> General
Product external reference -> empty
Quantity -> uncheck Customers can purchase more than 1 unit of this product.
Product type -> Regular
Price -> check This product does not have a base price
Billing cycle -> select Months and write 1
Category -> select from Internet -> Tools & Utilities
Platforms -> Check all platforms
Download trial version -> empty
On the redirected page -> check Renewal price equal to initial purchase price -> click Update prices
Go to Fulfillment tab -> check Fulfillment made by you -> click Save
The Product ID: is the id you need