Unable to access Google place for iOS app even after adding billing address

[takrahul]

Hello Team, 
I have setup the places in my iOS project also I have created the project in google consul and added the billing account for the account and now I am getting the error while try to fetch the data from iOS app. 

Error: 

ERROR AUTO COMPLETE Error Domain=com.google.places.ErrorDomain Code=-4 "Operation failed due to an invalid (malformed or missing) API key. See the developer's guide (https://developers.google.com/places/ios-sdk/start) for information on creating and using an API key." UserInfo={NSLocalizedFailureReason=Operation failed due to an invalid (malformed or missing) API key. See the developer's guide (https://developers.google.com/places/ios-sdk/start) for information on creating and using an API key., NSUnderlyingError=0x600003b32bb0 {Error Domain=com.google.places.api.server.ErrorDomain Code=-2 "REQUEST_DENIED" UserInfo={NSLocalizedFailureReason=You must enable Billing on the Google Cloud Project at https://console.cloud.google.com/project/_/billing/enable Learn more at https://developers.google.com/maps/gmp-get-started, NSLocalizedDescription=REQUEST_DENIED}}}

Can you please help us?

Thanks, 
Rahul Tak