Recurring Executor (new module):
- Server-managed relayer keypair derived deterministically via HKDF
- Checks on-chain ERC-20 allowance before pulling funds
- Executes transferFrom when subscriptions are due
- Supports Base, Base Sepolia, and Ethereum mainnet
New API Endpoints:
- GET /api/payments/:id/subscription-info — returns relayer address and
approve calldata for the client to authorize recurring pulls
- POST /api/payments/:id/subscribe — registers a subscription after
payer approves on-chain allowance, verifies allowance exists
Scheduler Upgrade:
- Attempts automated pull first for subscriptions with approved allowance
- Falls back to email reminder if auto-pull fails or is not configured
- Sends branded receipt email after successful automated payments
- Extracted email templates into reusable helper functions
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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