The debugging saga from this session — the accepted / PaymentRequirements / maxTimeoutSeconds payload shape that nobody documents, with the real CDP error messages you hit.
Teaches: the exact envelope shape CDP validates, why the obvious guesses fail, how to sign the EIP-3009 authorization.
Why it wins: almost nobody has done a real mainnet x402→CDP payment and written it up. It'll rank for the exact error strings people Google, and it reaches your ideal audience (people building x402 payments). A genuine gift to the ecosystem = reputation.
Traceipt fit: it's the case study; one link at the end.
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