diff --git a/src/Meritoo/LimeSurvey/ApiClient/Result/Processor/ResultProcessor.php b/src/Meritoo/LimeSurvey/ApiClient/Result/Processor/ResultProcessor.php
index 2d13850..7e1b46c 100644
--- a/src/Meritoo/LimeSurvey/ApiClient/Result/Processor/ResultProcessor.php
+++ b/src/Meritoo/LimeSurvey/ApiClient/Result/Processor/ResultProcessor.php
@@ -81,6 +81,7 @@ class ResultProcessor
         $method = MethodType::getValidatedMethod($method);
 
         switch ($method) {
+            case MethodType::ADD_PARTICIPANTS:
             case MethodType::GET_PARTICIPANT_PROPERTIES:
                 $item = new Participant();
                 break;
diff --git a/src/Meritoo/LimeSurvey/ApiClient/Type/MethodType.php b/src/Meritoo/LimeSurvey/ApiClient/Type/MethodType.php
index 499222f..c9ee1ce 100644
--- a/src/Meritoo/LimeSurvey/ApiClient/Type/MethodType.php
+++ b/src/Meritoo/LimeSurvey/ApiClient/Type/MethodType.php
@@ -19,6 +19,16 @@ use Meritoo\LimeSurvey\ApiClient\Exception\UnknownMethodException;
  */
 class MethodType extends BaseType
 {
+    /**
+     * Add participants to the tokens collection of the survey
+     *
+     * Returns the inserted data including additional new information like the Token entry ID and the token string.
+     * In case of errors in some data, return it in errors.
+     *
+     * @var string
+     */
+    const ADD_PARTICIPANTS = 'add_participants';
+
     /**
      * Add a response to the survey responses collection.
      * Returns the id of the inserted survey response.
@@ -104,6 +114,7 @@ class MethodType extends BaseType
         $method = static::getValidatedMethod($method);
 
         return in_array($method, [
+            static::ADD_PARTICIPANTS,
             static::LIST_PARTICIPANTS,
             static::LIST_QUESTIONS,
             static::LIST_SURVEYS,
diff --git a/tests/Meritoo/LimeSurvey/Test/ApiClient/Type/MethodTypeTest.php b/tests/Meritoo/LimeSurvey/Test/ApiClient/Type/MethodTypeTest.php
index 4def3cc..d4571d0 100644
--- a/tests/Meritoo/LimeSurvey/Test/ApiClient/Type/MethodTypeTest.php
+++ b/tests/Meritoo/LimeSurvey/Test/ApiClient/Type/MethodTypeTest.php
@@ -162,6 +162,7 @@ class MethodTypeTest extends BaseTypeTestCase
     protected function getAllExpectedTypes()
     {
         return [
+            'ADD_PARTICIPANTS'           => MethodType::ADD_PARTICIPANTS,
             'ADD_RESPONSE'               => MethodType::ADD_RESPONSE,
             'EXPORT_STATISTICS'          => MethodType::EXPORT_STATISTICS,
             'GET_PARTICIPANT_PROPERTIES' => MethodType::GET_PARTICIPANT_PROPERTIES,