Features

• flexible to add your own coupon model
• support fixed coupons
• support percentage coupons
• calculate the discount value
• calculate total price after discount

Getting started

Usage

 final coupon = Coupon.percentage(discountPercentage: 30); // or use Coupon.fixed
 num discountValue = coupon.discountValueFor(200) ;  // 60
 num totalAfterDiscount = coupon.totalAfterDiscount(200); // 140;

TODO

• support max discount value
• support Expire date for coupons