| EnvironmentalVariables | Provides methods for obtaining environmental variables in a platform-independant manner. |
| LogMessageScrubbers | Static utility methods for scrubbing sensitive information from logs for outgoing requests. |
| MapEntries | Static utility methods for working with ads `MapEntry` objects. |
| OAuth2TokenRefresher | Provides functionality with retrieving OAuth2 access tokens using an OAuth2 token fetcher, handling refreshing the token if it's about to expire. |
| Reflection | Encapsulates common reflection use cases to make them easier to use. |
| SoapHeaders | Static utility methods for working with SOAP request and response headers. |