Country Codes in Payment Processing and Financial Systems

Country Codes in Payments

Payment systems use ISO country codes at every stage — from the checkout form to settlement. Getting the country right affects currency, tax, fees, and compliance.

ISO Country Codes in Financial Standards

Standard	Uses	Example
ISO 4217 (Currency)	First 2 letters = country alpha-2	USD, GBP, JPY, EUR
SWIFT/BIC	Country code in positions 5-6	BOFAUS3N (Bank of America, US)
IBAN	Country alpha-2 prefix	GB29 NWBK 6016 1331 9268 19
ISO 8583 (Card txn)	Numeric country code in field 43	840 (USA) in merchant location

Payment Gateway Integration

Payment processors like Stripe require country codes in multiple contexts:

// Stripe: Creating a payment intent
const paymentIntent = await stripe.paymentIntents.create({
  amount: 2000,
  currency: 'usd',
  payment_method_types: ['card'],
  shipping: {
    address: {
      country: 'US',      // alpha-2
      state: 'CA',
      city: 'San Francisco',
      postal_code: '94102',
      line1: '123 Main St',
    },
    name: 'John Doe',
  },
});

Currency Determination

The billing country typically determines the default currency:

Country (Alpha-2)	Currency (ISO 4217)	Symbol
US	USD	$
GB	GBP	£
JP	JPY	¥
EU member states	EUR	€
CH	CHF	CHF
AU	AUD	A$
CA	CAD	C$

Tax Calculation

Country codes drive tax rules:

US → Sales tax (varies by state, city, ZIP)
GB → VAT 20%
JP → Consumption tax 10%
DE → Mehrwertsteuer 19%
AU → GST 10%
CA → GST 5% + Provincial (varies)

PCI DSS and Compliance

Card data handling requirements vary by country:

• EU (GDPR) — Additional data protection requirements
• India (RBI) — Card data must be stored in India
• China (PCIDSS CN) — Local compliance requirements
• Brazil (LGPD) — Brazilian data protection law

Fraud Prevention

Country codes are a key signal in fraud detection:

Risk signals:
- Billing country ≠ IP geolocation country
- Shipping country ≠ billing country
- Country on sanctions list
- High-risk country for card fraud