Reviewed 21 September 2026. A practical reference note for writers and readers; it is not a live quote or an issuer balance check.
A number copied from a calculator loses meaning when its inputs disappear. A useful citation lets the next reader identify the same scenario, see when the observation was made, and recognize what the source did not establish.
On this page: preserve the scenario; distinguish two dates; use a short reference note; check before sharing.
Record the brand, issuing country, card currency, denomination and actual format. Keep the output currency separate. A card denominated in dollars and a result displayed in naira describe two different fields.
Use the source's own format label. A photograph of a physical card does not automatically make it an e-code. If a field is missing, write “not stated” rather than guessing it from a flag, a currency symbol or a nearby example.
The date you opened a page is your observation date. The date attached to its data is the source's update date. They may be different. Copy both when available, and keep any time zone shown with a timestamp.
If you cannot find an update date, say so. Do not substitute the current date or a copyright year at the bottom of the page. For the meaning and limits of CardFlow's figures, read our rate-data methodology alongside the estimate.
Copy this structure into your own notes. It deliberately contains no live rate and no redeemable card information.
Source title and public URL:
Observed on, including time zone if relevant:
Source update date, or “not stated”:
Brand and issuing country:
Card currency, denomination and format:
Output currency and displayed estimate:
Visible limitations or conditions:
For a hypothetical example, “US-issued physical Apple card; USD 100 face value; output requested in NGN” describes a scenario. It does not state a usable balance, establish ownership or promise an offer. Keep any number you record attached to that scenario and its dates.
Open the link once and compare the visible inputs with your note. If the source has changed, preserve the date of the older observation and label it historical. Do not silently replace one field while leaving the old estimate beside it.
Share the public source URL and descriptive fields only. Do not include a card number, PIN, redemption code, private receipt, account page or support conversation. If a public calculator URL contains descriptive scenario parameters, inspect them before copying it; a long URL is not automatically a safe one.
A useful citation carries its context with it: source, scenario, observation date, source date and limits. When one of those is unknown, make the gap visible. The reader can then revisit the source without mistaking an old research note for a current quote.