diff --git a/CRM/TwingleCampaign/Utils/APIWrapper.php b/CRM/TwingleCampaign/Utils/APIWrapper.php
index 5afe426..4397aa1 100644
--- a/CRM/TwingleCampaign/Utils/APIWrapper.php
+++ b/CRM/TwingleCampaign/Utils/APIWrapper.php
@@ -103,12 +103,12 @@ class CRM_TwingleCampaign_Utils_APIWrapper {
    * the de.systopia.twingle extension can include the campaign into the
    * contribution which it will create.
    *
-   * @param $apiRequest
-   * @param $callsame
+   * @param array $apiRequest
+   * @param callable $callsame
    *
    * @return mixed
    */
-  public function mapDonation($apiRequest, $callsame) {
+  public static function mapDonation(array $apiRequest, callable $callsame) {
 
     if (array_key_exists(
       'campaign_id',
@@ -207,4 +207,4 @@ class CRM_TwingleCampaign_Utils_APIWrapper {
     }
   }
 
-}
\ No newline at end of file
+}