私は全額払い戻しを行い、このエラーメッセージが表示されます。払い戻し操作で「INTERNAL_SERVICE_ERROR」になるサンドボックスの残りの部分
RefundRequest refund = new RefundRequest();
Sale sale = new Sale();
sale.setId(paymentId);
try {
sale.refund(context, refund);
} catch (PayPalRESTException e) {
throw new PaymentException(e);
}
response-code: 500 details: name: INTERNAL_SERVICE_ERROR message: An internal service error occurred. details: null debug-id: ddc5e8373a92c information-link: https://developer.paypal.com/webapps/developer/docs/api/#INTERNAL_SERVICE_ERROR