Method: Determine if a coupon is expired

Method: Perform all available validations and return a success or error message

Method: Retrieve the timestamp of a coupon expiration date Transforms the expiration date to a timestamp and adds 23 hours 59 minutes and 59 seconds to the date Coupons expire end of day on the expiration date (EG: 2015-12-01 @ 23:59:59)

Method: Get the discount type for human reading and allow translation

Method: Get the formatted coupon amount with currency symbol and/or percentage symbol

Method: Get an array of all products the coupon can be used with Combines $this->coupon_courses & $this->coupon_membership

Method: Get the number of remaining uses calculated by subtracting # of uses from the usage limit

Method: Get the number of times the coupon has been used

Method: Determine if the main (non-trial) price is discounted by this coupon