1. Create coupon app to connect to retailer.
Set WebHook callback URL:
curl https://api.cardspring.com/v1 -X PUT \
-d event_callback_url="https://your.site.com/event" \
...
Create app and connect to business:
curl https://api.cardspring.com/v1/businesses/O7WYg1/apps -X POST \
-d discount_description="$10 coupon for Example store" \
-d notification[type]=authorization_event \
-d redemption[amount]=1000 \
...