Fixed possible issues with API communication caused by non-alphanumeric characters in request boundary

Author: maxguru

modules/pdf-ninja.php

@@ -705,7 +705,7 @@ public function api_upload_file( $attachment_id )
 			'key'    => $this->get_key(),
 		);
 
-		$boundary = wp_generate_password( 24 );
+		$boundary = wp_generate_password( 48, $special_chars = false, $extra_special_chars = false );
 
 		$payload = "";
 
@@ -892,7 +892,7 @@ private function api_pdf_helper( $destfile, $endpoint, $attachment_id, $data, $e
 				$params[$key] = $value;
 		}
 
-		$boundary = wp_generate_password( 24 );
+		$boundary = wp_generate_password( 48, $special_chars = false, $extra_special_chars = false );
 
 		$payload = "";