O/COfferChecksum
Ask a sellerMake a receipt ↘

ORDER PROMISE GAP CHECK · PRIVATE IN YOUR BROWSER

What did the receipt leave unwritten?

Mark the commercial promises you can already see in writing. The check names the gaps and creates one message asking the seller to record them before you pay.

CHECK WRITTEN COVERAGE

Which promises are already written?

Keep it public: do not enter customer names, emails, addresses, private invoice links, payment details, or secrets.

01 · CHECK

Six topics, no upload

The page runs locally in your browser and does not read an order page or conversation.

02 · ASK

Only missing topics are named

The generated message gives the seller a blank form to review through your existing written channel.

03 · SEAL

The seller controls the promise

No commercial field is assumed. A receipt exists only after the seller chooses the exact public terms.

04 · REFER

Verification carries the loop

Every sealed receipt links back to the checker, request builder, and free generator.