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Merchant-locked or single-use: which virtual card should I use?

Use a single-use card for a purchase you intend to make once. Use a merchant-locked card for a recurring payment or a store you return to. These controls vary by provider, so confirm the exact card behaviour and refund treatment before using one for an important purchase.

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The difference in one line each

  • Single-use: designed for one completed purchase. The provider decides exactly when it closes and how later adjustments or refunds are handled.
  • Merchant-locked: designed to work with one merchant while blocking use elsewhere. The provider's matching rules decide what counts as that merchant.
  • Category controls: some card programs let you limit spending to a category, such as groceries or transit.
  • General-purpose virtual cards: a separate number that can still have limits, depending on the program.

When single-use is the right call

  • Free trials. It can limit a later conversion charge, but you should still cancel with the merchant before the trial ends.
  • One-time purchases from a store you may never use again — the classic case for not leaving a permanent number in someone's database.
  • Unfamiliar stores you have checked before buying. A single-use card can limit later use, but it cannot guarantee that the merchant will deliver.
  • Marketplace sellers and small independent sites, where the security posture is unknown and the relationship is one purchase long.

When merchant-locked is the right call

  • Subscriptions. A dedicated card can separate one subscription from the rest of your wallet. It does not replace cancelling the contract with the merchant.
  • Stores you buy from repeatedly. A dedicated, merchant-restricted number can separate those purchases from your other spending, subject to the provider's rules.
  • Anything with variable billing, such as utilities or usage-based software, where a single-use card would interrupt a later invoice. Check whether the program supports a limit before relying on one.
  • Anything you may need refunded. A merchant-locked card that is still open is the simplest possible refund path.

The refund question, answered properly

Refund handling belongs to the issuer's program rules. Before using a single-use or closed virtual card for an order that may need a refund, read those rules or ask the provider directly.

Single-use can also be a poor fit for partial captures or multi-shipment orders. A retailer that authorises now and charges by shipment may need a card that remains available for later charges.

A setup that works

  1. One merchant-locked card per subscription

    Name it after the service so the payment is easy to identify. Still cancel with the merchant when you want the contract to end.

  2. One merchant-locked card per store you use regularly

    Save the dedicated number with a merchant you trust. If it is exposed, check with the issuer whether replacing it leaves your other cards and payments unaffected.

  3. Single-use for everything else

    Use it for a one-off purchase when the provider's refund and authorisation rules fit the order.

  4. Caps on anything that could grow

    If the program offers a cap, set it with enough room for taxes or a legitimate change in price. Review the payment rather than assuming a declined charge resolves the contract.

Related questions

  • Can I get a refund on a single-use card after it closes?

    It depends on the issuer and card program. Some programs can route a refund after a virtual number closes, while others have different rules. Confirm that process before using a single-use card for a purchase that may need a return.

  • What happens if I use a merchant-locked card at the wrong store?

    The card program may decline it, depending on how its merchant matching works. If you expect to use that card elsewhere, check the provider's controls before creating it rather than assuming every merchant lock works the same way.

  • Do single-use cards work for subscriptions?

    They are usually a poor fit. A subscription needs a card that can handle later charges, and a provider may also have rules for recurring authorisations. Cancel a free trial with the merchant instead of relying only on a card change.

  • How many virtual cards should one person have?

    As many as the merchants you pay regularly, plus a disposable one whenever you buy something once. In practice that is a handful of locked cards for subscriptions and frequent stores, and single-use cards created and discarded as you go.

Sources and scope

This guide is published by ReVault, which develops a virtual-card platform for Canada. The sources below explain the examples and procedures discussed; controls, protections and refunds depend on each card program.

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