feat(recurring): add 0.2.0 cancel, hash, and sign helpers

[LeoSlrRf]

Add EIP-712 signing, schedule cancellation, and batch key lookup for ERC20 recurring payment proxy v0.2.0

Adds several new capabilities to the ERC20 recurring payment proxy v0.2.0 integration:

• cancelScheduleBatch / encodeCancelScheduleBatch: Allows a permit subscriber to cancel an existing schedule by sending a cancelScheduleBatch transaction to the proxy.
• hashScheduleBatch: Computes the off-chain EIP-712 digest of a SchedulePermitBatch using the ERC20RecurringPaymentProxy / 1 domain, matching the on-chain contract domain.
• signSchedulePermitBatch: Signs a SchedulePermitBatch with EIP-712 typed data, falling back from eth_signTypedData RPC to _signTypedData when the provider does not support the RPC method directly.
• scheduleKeyFromBatch: Calls the scheduleKeyFromBatch view function on the deployed v0.2.0 proxy contract to retrieve the on-chain schedule key for a given permit.

Extracts a shared sendToRecurringProxyV2 helper to deduplicate transaction dispatch logic across triggerRecurringPaymentBatch and cancelScheduleBatch.

[LeoSlrRf]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• feat(recurring-payment): contract deployment #1767
• feat(recurring): add 0.2.0 admit and revoke cycle helpers #1766
• feat(recurring): add 0.2.0 cancel, hash, and sign helpers #1765 👈 (View in Graphite)
• feat(recurring): add 0.2.0 types and batch trigger helpers #1764
• feat: ERC20RecurringPaymentProxy batch schedule v0.2.0 #1763
• master

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[greptile-apps]

Greptile Summary

The PR adds helpers for encoding and submitting recurring-payment cancellation, deriving schedule hashes and keys, and signing v0.2.0 batch permits.

• Centralizes v0.2.0 transaction submission through a shared proxy sender.
• Adds EIP-712 domain construction, hashing, and signer support.
• Adds tests for cancellation encoding/submission, hashing, key lookup, and typed-data fallback signing.

Confidence Score: 5/5

The PR appears safe to merge with no concrete blocking or independently actionable non-blocking issue identified.

The new helpers use the v0.2.0 ABI and deployment lookup consistently, and their EIP-712 domain and permit field ordering match the corresponding contract implementation and shared types.

Important Files Changed

Filename	Overview
packages/payment-processor/src/payment/erc20-recurring-payment-proxy.ts	Adds v0.2.0 cancellation, hash, key, and typed-data signing helpers aligned with the contract domain, ABI, and shared permit type.
packages/payment-processor/test/payment/erc-20-recurring-payment.test.ts	Adds focused unit coverage for each new helper, including unsupported deployment handling and typed-data fallback signing.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  P[SchedulePermitBatch] --> E[Encode cancellation]
  P --> H[EIP-712 hash]
  P --> S[Typed-data signature]
  P --> K[On-chain schedule key]
  E --> T[Submit to v0.2.0 proxy]
  H --> V[Permit verification]
  S --> V

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