curl -s https://skymilesairporttransfers.com/api/v1/quote \
-H "x-api-key: YOUR_KEY" \
-H "content-type: application/json" \
-d '{"pickup":{"lat":51.5074,"lng":-0.1278},
"dropoff":{"lat":51.5155,"lng":-0.1410},
"class":"saloon"}'
More endpoints are documented in the repo README.