In administration panel go to Configuration => Configure modules
Select Discounts module
After selecting this option and entering a coupon code, the highest discount in a shopping cart will always be taken into account.
Example:
In the cart there are two products in the 50% promotion and one product with a 5% promotion. The customer enters the coupon code with 7% discount => 2 products in the promotion of 50% will remain unchanged, and 3 product will receive a discount of 7%.
Check out discounts documentation.
In administration panel go to Sale => Discounts
Select Coupon codes
Column Generated for contains an information about a coupon code granted to a customer for an order.
Code is generated automatically.
Value of 0 means there is no limit.
An empty field means there is no threshold.
An empty field means there is no threshold.
In administration panel go to Sale => Orders => Statuses
A single coupon code will be added to an e-mail notification. Coupon code can be generated only for the order status type completed.
Specifies the number of days after which a generated coupon code becomes invalid. Value of 0 means there is no limit.
Information about granted coupon code fo an order is given on coupon code list in column Generated for.
Check out orders documentation.