ResultProcessor - add support of the "add_participants" method

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;

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,