There is no universal card-payment rule that fixes every exchange rate at authorization or recalculates it at capture. The answer depends on which conversion you mean: a Dynamic Currency Conversion (DCC) quote shown to a shopper, the card network or issuer’s conversion for the cardholder’s bill, or a payment provider’s conversion for merchant settlement. These are separate parts of a payment and can follow different rules.
First, separate authorization, capture and settlement
Authorization is the request to approve a payment; capture is the instruction to finalize some or all of that authorized payment. Clearing and settlement are later processing stages. The rate relevant to one stage or currency conversion does not automatically govern every other stage.
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“The FX rate” can refer to a conversion from the shopper’s transaction currency to their card billing currency, or from the payment provider’s processing currency to the merchant’s holding or payout currency. In a DCC transaction, it can also refer to a rate quoted to the shopper at checkout. To explain a difference, identify the currencies and the party responsible for each conversion before comparing timestamps.
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| Conversion | Who sets or applies it | What the cited guidance says about timing | Useful evidence |
|---|---|---|---|
| DCC: shopper is offered a charge in their billing currency | A DCC provider or payment integration supplies the quote; implementation terms vary. | Visa Acceptance Solutions’ documented DCC capture flow says to reuse the authorization rate. JPMorgan’s documentation says qualifying incremental authorizations or completions use the currently available conversion rate. | Quote and rate timestamp, currencies and amounts, DCC acceptance, authorization and capture details. |
| Network or issuer conversion: transaction currency to card billing currency | Visa’s rules distinguish the issuer’s rate to its cardholder from the acquirer’s rate to its merchant. | Visa says the same rate applies across authorization, clearing and settlement for the majority of cross-currency transactions across VisaNet, effective April 2021. | Transaction currency, cardholder billing currency, statement entry and applicable issuer fees. |
| Merchant settlement FX: provider processing currency to merchant currency | The payment provider applies the terms of its merchant agreement. | Under PayPal’s FX as a Service agreement, a qualifying transaction with the relevant FX ID captured during its rate period uses that period’s rate; specified out-of-period or untagged cases use the rate in effect at capture. | FX ID, rate period, authorization and capture timestamps, settlement record and contract terms. |
DCC: a quoted rate is not the same as every other card conversion
DCC lets a shopper choose whether to pay in their card’s billing currency rather than the merchant’s local currency. The shopper should see the converted amount and the exchange rate before deciding. Visa’s consumer guidance says the shopper should be offered a choice, not have DCC selected for them, and can decline if key details are missing or they feel pressured.
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The operational rule depends on the specific integration. Visa Acceptance Solutions’ DCC capture guidance instructs merchants to apply the authorization rate at capture and not capture more than the originally authorized amount. By contrast, JPMorgan’s in-store DCC documentation describes qualifying incremental authorization or completion transactions as using the currently available conversion rate. These are provider- and operation-specific instructions, not a single rule for all DCC or card payments.
Receipts can help show what was quoted and captured. Adyen’s DCC receipt guidance calls for the rate and its source, markup, shopper and local-currency amounts, and a statement that the shopper accepted DCC. For an integration using authorization adjustment, it also advises setting up capture webhooks and adding capture details to the receipt or invoice.
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Network conversion: Visa’s policy has a defined scope
Visa announced that, effective April 2021, it would assess the same exchange rate across authorization, clearing and settlement for the majority of cross-currency transactions across VisaNet. That policy is specific to the stated Visa network transactions; it does not establish the timing used by every issuer, acquirer, payment provider or merchant settlement product. Visa’s announcement describes the change.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallVisa’s rules define its Currency Conversion Rate by reference to wholesale currency market rates available for the transaction or a government-mandated rate. They distinguish the rate an issuer sets for its cardholder from the rate an acquirer sets for its merchant, subject to applicable law and rules; an issuer may also apply an optional fee to cardholder conversion. A merchant payout amount therefore should not be assumed to equal a cardholder’s converted statement amount.
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A displayed rate lookup may be indicative rather than transaction-specific. Visa’s Foreign Exchange Rates API documentation says daily card rates may differ from actual transaction settlement rates. An API result alone does not prove which rate was applied to a particular payment.
Merchant settlement FX: the agreement can make capture timing decisive
PayPal’s FX as a Service agreement provides a concrete example of provider-side settlement rules. It associates a rate with an FX ID and rate period. Transactions authorized and captured within the applicable period, with the corresponding FX ID supplied, are settled at that period’s rate. The agreement also defines a two-hour cutoff mechanism for certain transactions after a rate period ends. For cases outside the applicable period or cutoff, or when no FX ID is submitted, it specifies the rate in effect at capture. The merchant is responsible for supplying the FX ID.
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This is a contract-specific example, not a general card-network rule. The agreement also assigns the merchant the risk if the customer-facing price uses a different rate from the provider’s settlement rate. Other providers’ contracts may handle late captures, missing identifiers, partial captures, refunds or chargebacks differently.
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How to investigate a rate difference
For a merchant or product team, reconstruct the payment with the records for the specific conversion leg. Do not infer the rate from an indicative lookup or from a general network policy.
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- Label the conversion. Mark each FX event as DCC, network or cardholder billing conversion, or merchant settlement FX.
- Keep the quote identifiers. Persist the quote or FX ID, currency pair, quote timestamp, rate-period identifier, markup and fee fields supplied by the provider.
- Keep lifecycle timestamps separate. Record authorization, any incremental authorization or adjustment, capture, and settlement independently.
- Compare currencies and amounts. Check transaction, billing, presentment and merchant holding currencies, and compare the authorized and captured amounts. Apply the documented integration’s amount limits and rate instructions.
- Reconcile the final record. Compare capture webhooks and settlement reports with receipts or invoices. For DCC, retain the displayed rate, its source and evidence of the shopper’s choice where available.
- Read the actual provider agreement. Check its cutoff windows and terms for late or partial captures, missing identifiers, refunds and chargebacks instead of extrapolating from another provider’s rules.
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