Course settings - Payment
Free course.
If no payment method is added to the course in the payment settings, “Free” will be indicated instead of the price.
Paid-for course
In the payment settings, set the course price from $1 to $100000.
Promotional Codes
If the promo code sets a discount of 100%, then upon its application, the course shall be set as "free", and the course price shall equal $0.
If upon the application, the promo code sets the course price at less than $1, then the course price shall stay at $1.