feat: add 'SEB Kort Bank AB' credit card support (#325)

* feat: add 'SEB Kort Bank AB' credit card support

* add: release notes for #325

* Calculate balance correctly for SEB Kort credit cards

Author: walleb

src/app-gocardless/bank-factory.js

@@ -11,6 +11,7 @@ import SparNordSpNoDK22 from './banks/sparnord-spnodk22.js';
 import Belfius from './banks/belfius_gkccbebb.js';
 import SpkMarburgBiedenkopfHeladef1mar from './banks/spk-marburg-biedenkopf-heladef1mar.js';
 import SEBPrivat from './banks/seb-privat.js';
+import SEBKortBankAB from './banks/seb-kort-bank-ab.js';
 
 const banks = [
   AmericanExpressAesudef1,
@@ -25,6 +26,7 @@ const banks = [
   Belfius,
   SpkMarburgBiedenkopfHeladef1mar,
   SEBPrivat,
+  SEBKortBankAB,
 ];
 
 export default (institutionId) =>

src/app-gocardless/banks/seb-kort-bank-ab.js

@@ -0,0 +1,62 @@
+import {
+  printIban,
+  amountToInteger,
+  sortByBookingDateOrValueDate,
+} from '../utils.js';
+
+/** @type {import('./bank.interface.js').IBank} */
+export default {
+  institutionIds: ['SEB_KORT_AB_SE_SKHSFI21'],
+
+  normalizeAccount(account) {
+    return {
+      account_id: account.id,
+      institution: account.institution,
+      mask: account.iban.slice(-4),
+      iban: account.iban,
+      name: [account.name, printIban(account)].join(' '),
+      official_name: account.product,
+      type: 'checking',
+    };
+  },
+
+  /**
+   * Sign of transaction amount needs to be flipped for SEB credit cards
+   */
+  normalizeTransaction(transaction, _booked) {
+    return {
+      ...transaction,
+      // Creditor name is stored in additionInformation for SEB
+      creditorName: transaction.additionalInformation,
+      date: transaction.valueDate,
+      transactionAmount: {
+        // Flip transaction amount sign
+        amount: (-parseFloat(transaction.transactionAmount.amount)).toString(),
+        currency: transaction.transactionAmount.currency,
+      },
+    };
+  },
+
+  sortTransactions(transactions = []) {
+    return sortByBookingDateOrValueDate(transactions);
+  },
+
+  /**
+   *  For SEB_KORT_AB_SE_SKHSFI21 we don't know what balance was
+   *  after each transaction so we have to calculate it by getting
+   *  current balance from the account and subtract all the transactions
+   *
+   *  As a current balance we use `expected` balance type because it
+   *  corresponds to the current running balance, whereas `interimAvailable`
+   *  holds the remaining credit limit.
+   */
+  calculateStartingBalance(sortedTransactions = [], balances = []) {
+    const currentBalance = balances.find(
+      (balance) => 'expected' === balance.balanceType,
+    );
+
+    return sortedTransactions.reduce((total, trans) => {
+      return total - amountToInteger(trans.transactionAmount.amount);
+    }, -amountToInteger(currentBalance.balanceAmount.amount));
+  },
+};

upcoming-release-notes/325.md

@@ -0,0 +1,6 @@
+---
+category: Features
+authors: [walleb]
+---
+
+Add custom bank adapter for 'SEB Kort Bank AB' to properly sync credit card transactions.