Contact
We welcome corrections, questions about the guides and feedback on the tools.
We aim to respond within two business days. Please include the page URL and a short description of the issue.
What to contact us about
- Corrections — factual errors, outdated card-network rules or broken links.
- Tool issues — a calculator or validator producing an unexpected result.
- Editorial feedback — suggestions for topics that would be useful.
- Accessibility — barriers using the site with assistive technology.
What we cannot help with
We do not sell cards, process orders, handle payments or provide account support for any store. For anything tied to a purchase, contact the store you used directly. We also cannot verify individual cards or provide account data.
Response times
Corrections are prioritised. Tool bugs are usually triaged within a week. General feedback may take longer during busy periods.