Please help on error with GoogleMapsPlatformAPI -- getting 403 in trace session

[charan19n]

When trying to access the below URL via ServiceCallout Policy in APIGEE,facing below error,

Please provide solution for the same.

https://maps.googleapis.com/maps/api/geocode/json?address=98101&region=US&sensor=false

{

"error_message" : "You must use an API key to authenticate each request to Google Maps Platform APIs. For additional information, please refer to http://g.co/dev/maps-no-account",

"results" : [],

"status" : "REQUEST_DENIED"

}