diff --git a/README.md b/README.md
index e405a08..842535f 100644
--- a/README.md
+++ b/README.md
@@ -52,30 +52,35 @@ public interface MyApi {
 ```java
 import wasapi.WasapiClient;
 
-MyApi api = WasapiClient.createService(MyApi.class, "https://api.example.com/");
+MyApiServices api = new WasapiClient.Builder()
+        .baseUrl("https://api.example.com/")
+        .build(MyApiServices.class);
 ```
 
 ### 3. Make API calls using `wasapi.Caller`
 
 ```java
-wasapi.Caller.call(api.getData(), new ApiCallback<MyResponse>() {
-    @Override
-    public void onSuccess(MyResponse response) {
-        // handle success
-    }
+import retrofit2.Call;
+import wasapi.WasapiUtilities;
+
+class MyApi extends WasapiUtilities {
 
-    @Override
-    public void onError(Throwable t) {
-        // handle error
+    MyApiServices api = new WasapiClient.Builder()
+            .baseUrl("https://api.example.com/")
+            .build(MyApiServices.class);
+
+    public static void main(String[] args) {
+        Call apicall = api.myApiCall();
+        perform(apicall);
     }
-});
+}
 ```
 
 ## Structure
 
 * **`wasapi.WasapiClient`**: Handles Retrofit service instantiation and base URL setup.
 * **`wasapi.Caller`**: Utility to execute API calls and process callbacks in a consistent way.
-* **`wasapi.WasapiUtilities`**: A place for common utilities (e.g., logging, checking response success, error parsing, etc.)
+* **`wasapi.WasapiUtilities`**: A utility class that provides utility methods for building multipart requests from files, monitoring HTTP response codes and validating fields in API responses.
 
 ## Contributing
 
diff --git a/src/main/java/wasapi/Caller.java b/src/main/java/wasapi/Caller.java
index d1de4d2..f5ef8ab 100644
--- a/src/main/java/wasapi/Caller.java
+++ b/src/main/java/wasapi/Caller.java
@@ -74,6 +74,27 @@ protected static <SuccessModel, ReturnType> ReturnType perform(
         return response.isSuccessful() ? (ReturnType) response.body() : getErrorBody(response, errorModels);
     }
 
+    /**
+     * Performs the given call and processes the response. This method provides advanced error handling capabilities.
+     *
+     * @param call The call to be executed. This is a retrofit2.Call object, which represents a request that has been prepared for execution.
+     * @param errorModels Varargs parameter. Each ErrorModel class is used to try to parse the error response if the call was not successful.
+     *
+     * @return A ResponseType object. If the call was successful, this is the body of the response. If the call was not successful and strict is false, this may be a parsed error response, or null if parsing the error response failed.
+     *
+     * @throws FailedCallException If strict is true, and the call failed or the response was not successful.
+     *
+     * @param <SuccessModel> The type of the successful response body.
+     * @param <ReturnType> The type of the return value in this method. This is either SuccessModel or ErrorModel.
+     */
+    @SuppressWarnings("unchecked")
+    protected static <SuccessModel, ReturnType> ReturnType perform(
+            Call<SuccessModel> call,
+            Class<?>... errorModels){
+        Response<?> response = call(call, false, false, getPreviousMethodName());
+        return response.isSuccessful() ? (ReturnType) response.body() : getErrorBody(response, errorModels);
+    }
+
     /**
      * Gets the response from an API call and logs the results.
      *