npm install softbankjs
or
yarn add softbankjs
import { SoftbankCreditCard } from 'softbankjs';
const sbInstance = new SoftbankCreditCard(endpoint, merchantId, serviceId, hashKey, locale);
const transaction = await sbInstance.createTransaction(customerId, orderId, itemId, amount, customerReturnFlg, encryptedFlg, requestDate, cardbrandReturnFlg);
await sbInstance.requestPurchase(transactionId, trackingId, processDate, requestDate);
await sbInstance.confirmTransaction(transactionId, trackingId, requestDate)
More docs: Here