feat(go): authCapture EVM scheme and escrow spec#2298
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Introduces the `escrow` scheme for x402, built on Base's Commerce Payments Protocol. Supports two settlement paths: authorize (funds held in escrow) and charge (direct to receiver), both refundable post-settlement. Refs: x402-foundation#834, x402-foundation#1011 Co-Authored-By: Claude Opus 4.6 <[email protected]>
- Generalize scheme_escrow.md to be network-agnostic - Tighten verification: strict amount equality, tokenCollector recipient check, settlement simulation - Add error codes section and assetTransferMethod note - Simplify nonce derivation explanation
- Rename escrow → commerce per reviewer feedback - Add expiry fields to PaymentRequirements example - Align expiry field descriptions and example values Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
Adds the commerce payment scheme using ReceiveWithAuthorization with AuthCaptureEscrow for authorize/charge settlement. Key differences from exact: deterministic nonce from PaymentInfo, funds flow through tokenCollector, exact amount matching, and escrow-based settlement. Co-Authored-By: Claude <[email protected]>
Co-Authored-By: Claude <[email protected]>
Co-Authored-By: Claude <[email protected]>
- Delete specs/schemes/commerce/ spec files; add specs/schemes/authCapture/ - Remove SchemeCommerce constant; rename CommercePaymentInfo → AuthCapturePaymentInfo, ComputeCommerceNonce → ComputeAuthCaptureNonce; drop deprecated CommercePayload types - Move go/mechanisms/evm/commerce/ → go/mechanisms/evm/authCapture/ (client/server/facilitator); rename CommerceEvmScheme → AuthCaptureEvmScheme and all constructors accordingly - Delete stale examples/go/commerce/; update core-select-requirement example to authCapture - Update ultravioleta-dao metadata.json schemes array Co-authored-by: Cursor <[email protected]>
Include .env-example, .gitignore for the built binary and local env, and a minimal client demonstrating authCapture payments. Co-authored-by: Cursor <[email protected]>
Co-authored-by: Cursor <[email protected]>
Co-authored-by: Cursor <[email protected]>
Move ComputeAuthCaptureNonce, PaymentInfoTypehash, and AuthCaptureEscrow contract ABIs from package evm into authCapture/core for parity with batch-settlement packaging. HashReceiveWithAuthorization stays in eip712.go. Co-authored-by: Cursor <[email protected]>
Require fee bounds and validate typed deadline/fee inputs so generated authCapture payloads match the current scheme requirements. Co-authored-by: Cursor <[email protected]>
Use the Base Commerce Payments v1.0.0 deployment addresses and validate authCapture amounts against the on-chain uint120 bound before signing. Co-authored-by: Cursor <[email protected]>
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Summary
main(no duplicate spec edits in this branch).specs/schemes/commerce/in favor of authCapture.examples/go/clients/authcapture/(with.gitignorefor the built binary and.env).ultravioleta-dao) schemes list to useauthCapture.Scope
go/mechanisms/evm/authCapture/, shared helpers inconstants.go,eip712.go,types.go, and related example server updates.Testing
go test ./mechanisms/evm/authCapture/...Made with Cursor