# Ecommerce Currency Conversion

> Use governed exchange-rate sources, update rules and fee disclosures while preserving the order’s recorded transaction amounts.

- Type: Merchant guide
- Level: Intermediate
- Reading time: About 4 minutes
- Audience: Written for store owners, builders, and designers refining high-performance ecommerce stores.
- Last updated: 2026-11-04
- Canonical page: https://academy.getzenbasket.com/merchant-questions/ecommerce-currency-conversion/
- Part of: [Merchant Questions](https://academy.getzenbasket.com/merchant-questions/) on ZenBasket Academy

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## What you need to know

### How should ecommerce currency conversion work?

Define a trusted rate source, update schedule, spread or pricing rule, rounding method and effective time. Store the exact rate and amounts used for each completed order.

### Where do exchange rates come from?

Rates may come from payment providers, banks, market-data services, or an internal treasury source. Document which rate governs display, charge, refund and accounting.

### How often should exchange rates update?

Update often enough for volatility and margin risk, with monitoring for stale or failed feeds. A fixed-price market may change less often through a controlled price review.

### Should stores use exact exchange-rate conversions?

Not always. Exact conversion produces moving, awkward prices; localized price lists can create stable customer-friendly amounts. The choice should protect margin and price consistency.

### What happens when exchange rates change after an order?

Do not rewrite a completed order. Refund and reporting workflows should retain its transaction currency and recorded amounts while separately recording any later conversion effect.

### Who pays currency-conversion fees?

The merchant, provider or customer’s card issuer may each apply a conversion-related charge or spread. Explain merchant-controlled charges and avoid promising what an issuer will do.

### Why did the customer's bank charge a different amount?

The issuer may convert the transaction, apply its own rate or fee, or process a currency different from the customer’s account. The merchant receipt should clearly show the currency and amount actually charged.

### A quick store check

Compare the displayed rate, charged amount, stored order rate and refund result for one multi-currency purchase.

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## Frequently asked questions

### Should refunds use today’s storefront rate?

Base the refund on the original transaction and provider rules, not a newly displayed product price.

### Can a stale rate feed be ignored briefly?

Use a defined fallback or pause affected pricing before margin and customer amounts become unreliable.

## Related articles

- **Multi-Currency Ecommerce Fundamentals**
- **International Ecommerce Pricing**