https://shipreadyai.dev/glossary/claim-token

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# Claim token

The unguessable string that lets you attach an anonymous result to your account later.

The free check needs no account. That creates a question: if you run a check and buy something an hour later, how does the purchase find the result?

A claim token answers it. When a check is created, a long random value is issued with it. Holding the token is what proves the result is yours. When you sign in at purchase, the token attaches the check to your account, once.

It has to be long enough that guessing is pointless, tied to a single check, and useless after it is redeemed. It is never a sequential number and never an email address. The alternative is forcing sign in before the free check, which would cost more people than it protects.