HTTP GET cannot pass a payload in its body

classes/session.php

@@ -140,9 +140,12 @@ class mod_labnbook_session
     protected function fetch($verb, $urlPath, $defaultValue = null, $payload = []) {
         $payload['key'] = $this->secret;
         $curl = curl_init();
+        if ($verb === 'GET') {
+            $urlPath .= (strpos($urlPath, '?') === false ? "?" : "&") . "key=" . rawurlencode($this->secret);
+        }
         curl_setopt_array($curl, [
             CURLOPT_RETURNTRANSFER => true,
-            CURLOPT_CUSTOMREQUEST, $verb,
+            CURLOPT_CUSTOMREQUEST => $verb,
             CURLOPT_URL => $this->url . "/api/index.php" . $urlPath,
             CURLOPT_HTTPHEADER, ['Content-Type:application/json', 'Accept:application/json'],
             CURLOPT_POSTFIELDS => json_encode($payload),