refactor(identity/ucp): payment handlers consume *RailSpec - #42
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mpp_payment_handler, x402_payment_handler, stripe_spt_payment_handler now accept *RailSpec instances instead of plain dicts. Tempo, Solana MPP, and TempoSession rails all flow through mpp_payment_handler in any mix; x402 takes X402BaseRailSpec; stripe takes StripeRailSpec (replacing the flat profile_id kwarg). CAIP-2 → UCP-namespace network conversion is internal: eip155:8453 → base-8453 eip155:84532 → base-84532 solana:5eykt4... → solana-mainnet-beta solana:EtWTRABZaY... → solana-devnet tempo-mainnet (UCP) → tempo-mainnet (passthrough) TempoRailSpec.testnet → tempo-testnet Mainnet + testnet for every rail is preserved. Per-order recipient factories are omitted from the static UCP profile (the authoritative recipient ships in the 402 body at request time instead); static string recipients are emitted verbatim. signed_ucp_merchant example migrated inline. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
`mpp_payment_handler`, `x402_payment_handler`, `stripe_spt_payment_handler` now accept `*RailSpec` instances directly instead of plain dicts. Tempo, Solana MPP, and TempoSession rails all flow through `mpp_payment_handler` in any mix; `x402_payment_handler` takes `X402BaseRailSpec`; `stripe_spt_payment_handler` takes `StripeRailSpec` (replacing the flat `profile_id` kwarg).
CAIP-2 → UCP-namespace network conversion is internal:
Mainnet + testnet for every rail is preserved.
Per-order recipient factories are omitted from the static UCP profile output (`if isinstance(r, str): include`); the authoritative recipient ships in the 402 body at request time. Static string recipients are emitted verbatim.
Helpers stay synchronous — the UCP profile is built at boot, no async resolution needed.
`signed_ucp_merchant` example migrated inline. New `tests/test_payment_handlers.py` covers every conversion path + the omit-factory branch.
Test plan
🤖 Generated with Claude Code