Add Arc Receipts Webhook Inbox + Replay

[horn111]

Description

Adds a local in-memory Webhook Inbox for Arc Receipts.

The demo now completes the full local payment ops loop:

create invoice
watcher sees payment
receipt generated
signed webhook delivered
SDK verifies signature
delivery attempt stored
webhook replayed with fresh timestamp

This turns the watcher flow into a verified delivery flow developers can run locally.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring

Related Issues

N/A

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have added tests that prove my feature works
• New and existing tests pass locally with my changes
• I have updated the documentation accordingly
• I have updated the CHANGELOG.md

Testing

• npm.cmd run typecheck
• npm.cmd run test --workspaces --if-present -- --reporter=dot
• node_modules\.bin\tsc.cmd --noEmit --project apps/demo/tsconfig.json --incremental false
• Local browser check on http://localhost:3005: Run Watcher Flow -> verified delivery attempt Add Arc Receipts MVP #1 -> Replay Webhook -> delivery attempt Add Arc Testnet receipt watcher #2 with fresh signature timestamp

Screenshots

N/A

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Project	Deployment	Actions	Updated (UTC)
arc-nano-kit-demo	Ready	Preview, Comment	Jun 28, 2026 4:16pm