diff --git a/api/iso20022.php b/api/iso20022.php
index 2fdfa52..3ec5535 100644
--- a/api/iso20022.php
+++ b/api/iso20022.php
@@ -326,3 +326,5 @@
 	// free memory
 	imagedestroy($qrcode);
 	imagedestroy($stamp);
+	// Clean temporary file.
+	unlink($pngAbsoluteFilePath);