chore: release v0.2.0

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0.11.0 (2026-07-16)

Minor Changes

• Validate the credential source on the Tempo hash-credential verification path. The server now parses the did:pkh:eip155 source before reserving the transaction hash, requires TIP-20 transfers to originate from the declared source address (falling back to the receipt sender when no source is provided), and rejects malformed or chain-mismatched sources with a uniform error. Adds ChargeMethod::with_validate_sender to authorize smart-account / relayer flows where the on-chain transfer sender differs from the declared source. (by @DerekCofausper, #315)
• Added a structured reason: Option<PaymentFailureReason> field to PaymentFailedContext, marked the struct #[non_exhaustive], and added PaymentFailedContext::new() and with_reason() constructors. Downstream callers should construct it via new() and destructure it with .. so future field additions remain non-breaking. (by @DerekCofausper, #315)
• Sponsored (fee-payer) charges now dry-run the co-signed transaction via tempo_simulateV1 before broadcasting. If the transaction would revert on-chain, the sponsor rejects it instead of paying gas for a failing transaction. The check fails closed: if the simulation RPC is unavailable, the charge is rejected. (by @DerekCofausper, #315)
• Added TIP-1034 Tempo session client primitives for descriptor-backed channels, precompile ABI helpers, voucher signing, and fee-sponsored session opens. (by @DerekCofausper, #315)

Patch Changes

• Added configurable incremental 402 challenge retries for HTTP clients. (by @DerekCofausper, #315)
• Rejected oversized WWW-Authenticate request parameters before decoding payment challenges. (by @DerekCofausper, #315)
• Updated README documentation with an expanded protocol description, added an MPP SDKs table listing official implementations in multiple languages, and cleaned up URLs and prose throughout. (by @DerekCofausper, #315)
• Add client-side Tempo chain pinning. TempoProvider::with_expected_chain_id rejects charge challenges whose methodDetails.chainId conflicts with the configured chain ID, and signs on the pinned chain when the challenge omits it — matching the mpp-go conformance ABI. (by @DerekCofausper, #315)
• Align Tempo zero-amount proof shape with the wallet proof flow. (by @DerekCofausper, #315)

0.2.0 (2026-07-16)

0.3.0 (2026-07-16)

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