Check the declared payer for signed Tempo payments - #32
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Committed-By-Agent: codex Co-authored-by: codex <noreply@openai.com>
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When a client submits a signed Tempo payment, it can also name the wallet that paid. We verified the payment but did not check that the named wallet matched the wallet that sent the tokens.
This change checks that the declared wallet address is valid, belongs to the expected chain, and matches the token sender. These are the same checks we already apply when a client submits a transaction hash. Clients can still omit the payer field.