public function customFieldsCreate($entity, $customField)
    {
        if (!count($customField) ||
            empty($customField['code']) ||
            empty($customField['name']) ||
            empty($customField['type'])
        ) {
            throw new \InvalidArgumentException(
                'Parameter `customField` must contain a data & fields `code`, `name` & `type` must be set'
            );
        }

        if (empty($entity) || !in_array($entity, ['customer', 'order'])) {
            throw new \InvalidArgumentException(
                'Parameter `entity` must contain a data & value must be `order` or `customer`'
            );
        }

        /* @noinspection PhpUndefinedMethodInspection */
        return $this->client->makeRequest(
            "/custom-fields/$entity/create",
            "POST",
            ['customField' => json_encode($customField)]
        );
    }