I have been working with js and php, I have been asked to create a webservice where by means of AJAX ask for the coordinates to display them on a map with the Google API.
All ready but I would like to know how to create a route to follow and that this is shown on the map.
I'm a real novice, here I am at zero.
On the same Google developers page, it explains a little bit about how to make the request to get the route you need to follow: Developer Guide
If I remember correctly (I no longer have access to that application) I used something like this:
https://maps.googleapis.com/maps/api/directions/json?origin=[origen]&destination=[destino]&key=[APIKEY]
Where origin and destination can be street names (spaces must change to +) or coordinates (latitude, longitude)