Got this from email:

Shutterfly: To qualify for the $20 offer, you must place an order between September 1, 2015 - November 3, 2015 and select Visa Checkout as the payment method. Customers who complete a purchase using Visa Checkout will receive an email containing a promo code good for $20 off one future qualifying merchandise order of $20 or more (after any other discounts and before taxes, shipping and handling) through shutterfly.com or our mobile-friendly site. $20 promo code expires November 15, 2015 (11:59 P.M. PT). Offer cannot be redeemed more than once per account and/or billing address. Each promo code can only be redeemed once. Taxes, shipping and handling will apply. Promo code is not valid on TripPix, personalized postage stamps, prepaid plans, gift certificates, Videograms, cards sent using mailing services, prior purchases, orders placed for in-store pick up and purchases made on the Shutterfly apps. Valid for the intended recipient only. Cannot be redeemed for cash or combined with other offers or credits. Not valid for resale.

Please note that you do not get $20 off instantly when you checkout the first time...Instead, you will get a code for $20 off for NEXTorder