Interswitch Wallets

Create Wallet

interface CreateWalletDto {
  firstName: string;
  lastName: string;
  email: string;
  phoneNumber: string;  // Nigerian format: +234XXXXXXXXXX
  pin: string;          // 4-digit PIN
  dateOfBirth?: string; // YYYY-MM-DD
  bvn?: string;         // Bank Verification Number (11 digits)
}

interface WalletResponse {
  walletId: string;
  pan: string;            // Virtual card PAN
  expiry: string;         // YYMM format
  cvv: string;            // 3-digit CVV
  virtualCard: boolean;
  accountNumber: string;  // Virtual account number
  bankCode: string;
  status: string;
}

async function createWallet(
  data: CreateWalletDto
): Promise<WalletResponse> {
  const headers = await getAuthHeaders();

  const response = await fetch(
    `${process.env.INTERSWITCH_WALLET_BASE_URL}/api/v1/wallet`,
    {
      method: 'POST',
      headers,
      body: JSON.stringify(data),
    }
  );

  if (!response.ok) {
    throw new Error(`Create wallet failed: ${response.status}`);
  }

  return response.json();
}

Input Validation

import { z } from 'zod';

const createWalletSchema = z.object({
  firstName: z.string().min(2).max(50),
  lastName: z.string().min(2).max(50),
  email: z.string().email(),
  phoneNumber: z.string().regex(
    /^\+234[0-9]{10}$/,
    'Must be Nigerian phone format: +234XXXXXXXXXX'
  ),
  pin: z.string().regex(/^[0-9]{4}$/, 'Must be 4-digit PIN'),
  dateOfBirth: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional(),
  bvn: z.string().regex(/^[0-9]{11}$/, 'BVN must be 11 digits').optional(),
});

Get Wallet Details

async function getWalletDetails(
  walletId: string
): Promise<WalletResponse> {
  const headers = await getAuthHeaders();

  const response = await fetch(
    `${process.env.INTERSWITCH_WALLET_BASE_URL}/api/v1/wallet/${encodeURIComponent(walletId)}`,
    {
      method: 'GET',
      headers,
    }
  );

  if (!response.ok) {
    throw new Error(`Get wallet failed: ${response.status}`);
  }

  return response.json();
}

Get Wallet Balance

interface WalletBalance {
  availableBalance: number;
  ledgerBalance: number;
  currency: string;
}

async function getWalletBalance(
  walletId: string
): Promise<WalletBalance> {
  const headers = await getAuthHeaders();

  const response = await fetch(
    `${process.env.INTERSWITCH_WALLET_BASE_URL}/api/v1/wallet/${encodeURIComponent(walletId)}/balance`,
    {
      method: 'GET',
      headers,
    }
  );

  if (!response.ok) {
    throw new Error(`Get balance failed: ${response.status}`);
  }

  return response.json();
}

Virtual Card Details

When a wallet is created, it includes virtual card details:

// WalletResponse includes:
// pan: '5061050200000000123'  — Virtual card number
// expiry: '2603'              — YYMM format
// cvv: '123'                  — 3-digit CVV
// virtualCard: true           — Confirms this is a virtual card

// These details can be used for:
// 1. Online payments (card-not-present)
// 2. Integration with payment gateways
// 3. Wallet-based purchases

Complete Wallet Management Flow

// 1. Create wallet for customer
const wallet = await createWallet({
  firstName: 'John',
  lastName: 'Doe',
  email: '[email protected]',
  phoneNumber: '+2348012345678',
  pin: '1234',
});
console.log('Wallet ID:', wallet.walletId);
console.log('Virtual Card PAN:', wallet.pan);

// 2. Check balance before transaction
const balance = await getWalletBalance(wallet.walletId);
console.log('Available:', balance.availableBalance);

// 3. Get full wallet details
const details = await getWalletDetails(wallet.walletId);
console.log('Account Number:', details.accountNumber);

Security Considerations

1. Never expose wallet PAN/CVV to client-side code
2. Store wallet IDs, not card details — retrieve when needed
3. Validate phone numbers — Nigerian format required (+234XXXXXXXXXX)
4. PIN handling — Never log or store PINs in plaintext
5. BVN data — Handle as PII, encrypt at rest