Make sure fields names are underscore format

src/Service/Resource.php

@@ -333,6 +333,12 @@ public function create($data)
             $data = ArrayUtils::iteratorToArray($data);
         }
 
+        $data = (array)$data;
+
+        foreach ($data as $key => $value) {
+            $data[$this->fromCamelCase($key)] = $value;
+        }
+
         $json = json_encode($data);
 
         if (false === $json) {
@@ -369,6 +375,11 @@ public function update($id, $data)
         if (!is_array($data)) {
             // throw 422
         }
+
+        foreach ($data as $key => $value) {
+            $data[$this->fromCamelCase($key)] = $value;
+        }
+
         $fields = http_build_query($data);
 
         $result = $this->request(self::ZOHO_API_ENDPOINT . $this->getPath() . '/' . $id, 'PUT', $fields);
@@ -386,4 +397,14 @@ public function delete($id)
         $this->request(self::ZOHO_API_ENDPOINT . $this->getPath() . '/' . $id, 'DELETE');
         return true;
     }
+
+    protected function fromCamelCase($input)
+    {
+        preg_match_all('!([A-Z][A-Z0-9]*(?=$|[A-Z][a-z0-9])|[A-Za-z][a-z0-9]+)!', $input, $matches);
+        $ret = $matches[0];
+        foreach ($ret as &$match) {
+            $match = $match == strtoupper($match) ? strtolower($match) : lcfirst($match);
+        }
+        return implode('_', $ret);
+    }
 }