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+## PayPal HttpClient
+
+PayPalHttp is a generic HTTP Client.
+
+In it's simplest form, an [`HttpClient`](lib/PayPalHttp/HttpClient.php) exposes an `execute` method which takes an [HTTP request](lib/PayPalHttp/HttpRequest.php), executes it against the domain described in an [Environment](lib/PayPalHttp/Environment.php), and returns an [HTTP response](lib/PayPalHttp/HttpResponse.php).
+
+### Environment
+
+An [`Environment`](./lib/PayPalHttp/environment.rb) describes a domain that hosts a REST API, against which an `HttpClient` will make requests. `Environment` is a simple interface that wraps one method, `baseUrl`.
+
+```php
+$env = new Environment('https://example.com');
+```
+
+### Requests
+
+HTTP requests contain all the information needed to make an HTTP request against the REST API. Specifically, one request describes a path, a verb, any path/query/form parameters, headers, attached files for upload, and body data.
+
+### Responses
+
+HTTP responses contain information returned by a server in response to a request as described above. They are simple objects which contain a status code, headers, and any data returned by the server.
+
+```php
+$request = new HttpRequest("/path", "GET");
+$request->body[] = "some data";
+
+$response = $client->execute($req);
+
+$statusCode = $response->statusCode;
+$headers = $response->headers;
+$data = $response->result;
+```
+
+### Injectors
+
+Injectors are blocks that can be used for executing arbitrary pre-flight logic, such as modifying a request or logging data. Injectors are attached to an `HttpClient` using the `addInjector` method.
+
+The `HttpClient` executes its injectors in a first-in, first-out order, before each request.
+
+```php
+class LogInjector implements Injector
+{
+    public function inject($httpRequest)
+    {
+        // Do some logging here
+    }
+}
+
+$logInjector = new LogInjector();
+$client = new HttpClient($environment);
+$client->addInjector($logInjector);
+...
+```
+
+### Error Handling
+
+`HttpClient#execute` may throw an `Exception` if something went wrong during the course of execution. If the server returned a non-200 response, [IOException](lib/PayPalHttp/IOException.php) will be thrown, that will contain a status code and headers you can use for debugging.
+
+```php
+try
+{
+    $client->execute($req);
+}
+catch (HttpException $e)
+{
+    $statusCode = $e->response->statusCode;
+    $headers = $e->response->headers;
+    $body = $e->response->result;
+}
+```
+
+## License
+PayPalHttp-PHP is open source and available under the MIT license. See the [LICENSE](./LICENSE) file for more information.
+
+## Contributing
+Pull requests and issues are welcome. Please see [CONTRIBUTING.md](./CONTRIBUTING.md) for more details.