Starbucks - 10% or 15% back, up to $5. I have both versions on various cards. terms imply not valid for app reloads. no idea if that is enforced.
OFFER DETAILS
Get 10% of your in-store purchase back as statement credit each time you use your enrolled Card at Starbucks by 9/30/2017. See terms for exclusions.
TERMS
Enrollment limited. Valid in-store only at stand-alone Starbucks locations. Valid at participating locations in US and US territories only. Not valid for online purchases or mobile app reloads. Excludes Starbucks within the following locations: i) retail stores, department stores, supermarkets, malls, outlet malls, ii) hotels, resorts, casinos, convention centers, cruise ships, theme parks, iii) airport terminals, train/bus stations, highway rest-stops, iv) hospitals, military bases, office buildings, and university/college campuses. Offer is non-transferable. Limit $5 in statement credit(s) per American Express® online account. Statement credit will appear on your billing statement within 90 days after 9/30/2017, provided that American Express receives information from the merchant about your qualifying purchase. Note that American Express may not receive information about your qualifying purchase from merchant until all items from your qualifying purchase have been provided/shipped by merchant. Statement credit may be reversed if qualifying purchase is returned/cancelled. If American Express does not receive information that identifies your transaction as qualifying for the offer, you will not receive the statement credit. For example, your transaction will not qualify if it is not made directly with the merchant. In addition, in most cases, you will not receive the statement credit if your transaction is made with an electronic wallet or through a third party or if the merchant uses a mobile or wireless card reader to process it. By adding an offer to a Card, you agree that American Express may send you communications about the offer. POID: CHW3:0002