| Exception |
| Guzzle |
| HasDataTrait | Basic collection behavior for Command and Result objects. |
| CommandInterface | A command object encapsulates the input parameters used to control the creation of a HTTP request and processing of a HTTP response. |
| ResultInterface | An array-like object that represents the result of executing a command. |
| ServiceClientInterface | Web service client interface. |
| ToArrayInterface | An object that can be represented as an array |
| Command | Default command implementation. |
| Result | Default command implementation. |
| ServiceClient | The Guzzle ServiceClient serves as the foundation for creating web service clients that interact with RPC-style APIs. |