This is a list of endpoints contained within Google Maps Web Services and their request parameters. The list will be further added to and updated over time, and also plan to add a list of return parameters for each endpoint.
[ ] Origin [ ] Address [x] Lat Long [ ] Place ID (premium account only) [ ] Destination [ ] Address [x] Lat Long [ ] Place ID (premium account only) [x] API Key
Multiple values for Origin and Destination currently not supported
[x] Travel Mode [ ] Language [ ] Avoid [ ] Units [ ] Arrival time [ ] Departure time [ ] Traffic model [x] Transit mode [ ] Transit routing preference