.get_credentials        Authentication of R app
.load_token             Loading the Access Token
.refresh_token          Refresh Access Token
authenticate            Invoke the Authentication Process with 'Google'
build_handle            Prepare Curl Request
default_search          Query Strings for Query Based Services
do_auth                 Deprecated Function
googleAdsFields         Construct googleAdsFields Class (S3)
googleAdsSearch         Construct googleAdsSearch Class (S3)
listAccessibleCustomers
                        Construct listAccessibleCustomers Class (S3)
query_google_ads        Query 'Google Ads' Data
