The version of the journey on the order date is central. Save the advertisement, landing page, price display, terms link, checkout and final button as screenshots or PDFs. Add the confirmation email, payment record, start of use and later messages about renewal or cancellation.
Technical details may also matter. Preserve the URL path, language, checkboxes, error messages and access time. A cancellation attempt should be recorded with sending time, confirmation, response and any later charge in one chronology.
When a charge is demanded, the communication should identify the specific issue. Separate an unclear order step, an ineffective renewal, a cancellation problem and a refund request. The advertising claims tool helps organise visible claims and evidence, but it does not replace contract review.