The Lanyards and pins are available at the Buzz Light year store, Trading post in Frontier town, DCA photoshop. There is a complete list on the back of the coupon when you receive it. One member of your party can just take them and receive them all. Pin stores are where they keep the ones from each travel company. They just grab your set ie. Costco, Disney Rewards, WDTC, AAA, etc.
The coupons are for stores in DTD and some restaurants. Someone else can speak more in detail. We don't seem to use them because we spend most our time in the parks.