Say what you are asking for.
A cover page should state the amount claimed. A letter in your own words explains the issue and the action you want the recipient to take.
Show how the amount was reached.
Month-by-month sales, actual processor and bank statements, and relevant deposit evidence support the claim. Separate direct Amex, other card-brand shortfalls and reserves clearly.
Track what happens next.
Review, edit and sign the packet before sending. Keep each version and log calls, emails and follow-up. Recovery is coming soon as a separate planned service, not a current promise.
Product information is based on the supplied brief. Example figures are illustrative. This article is not accounting, tax or legal advice.