src/Request.php
private function payload(array $auth, array $params)
    {
        $payload = array_merge($auth, $params);
        $payload = array_change_key_case($payload, CASE_LOWER);

        ksort($payload);

        return $payload;
    }
private function payload(array $auth, array $params)
    {
        $payload = array_merge($auth, $params);
        $payload = array_change_key_case($payload, CASE_LOWER);

        ksort($payload);

        return $payload;
    }
private function payload ( array $ auth , array $ params ) { $ payload = array_merge ( $ auth , $ params ) ; $ payload = array_change_key_case ( $ payload , CASE_LOWER ) ; ksort ( $ payload ) ; return $ payload ; }
Create the payload

@param array $auth
@param array $params
@return array
Create the payload