Macy's doesn't allow coupon stacking, you can only use one coupon per order. But that's a little misleading because often their coupons have a couple discounts wrapped up into one coupon code, like a percent off coupon that includes free shipping.
The only time that you can use the coupon at Macys for Coach or any other designer brand. Is usually around Christmas time when they send out Family and Friends and its usually 20 percent off all. If you don't have coupon the sales person will give you one to use if you ask.
To redeem a promo code during sign up: Visit showtime.com and select the option to start your free trial. Enter your name, credit card information and billing address. Under 'Apply Promo Code,' select the link to enter your promo code. Enter the promo code and click Apply.