public function declareRoutes(WordPressRouteCollector $r) {
        // REST handlers
        $request = new Api\Request($this->module);
        $capture = new Api\Capture($this->module);
        $cancel = new Api\Cancel($this->module);
        $refund = new Api\Refund($this->module);
        $adminroles = ['administrator', 'editor', 'wc_management'];

        // REST middleware
        $requestm = [$request->checkTotalPriceMiddleware(), $request->furiganaCheckMiddleware()];

        // REST routes
        $r->post('/request', [$request, 'request'], $requestm);
        $r->add('POST', '/capture/{orderId}', [$capture, 'capture'], [], [], $adminroles);
        $r->add('POST', '/void/{orderId}', [$cancel, 'cancel'], [], [], $adminroles);
        $r->add('POST', '/refund/{orderId}', [$refund, 'refund'], [], [], $adminroles);
    }