---
phase: 15-multi-signer-backend
plan: 02
subsystem: api
tags: [multi-signer, signing, email, jwt, drizzle, nextjs]

# Dependency graph
requires:
  - phase: 15-01
    provides: createSigningToken with signerEmail param, DocumentSigner type, signingTokens.signerEmail column
  - phase: 14-multi-signer-schema
    provides: documents.signers JSONB column, DocumentSigner interface
provides:
  - Multi-signer send route with one token per signer and parallel email dispatch
  - Legacy single-signer fallback preserved when doc.signers is null/empty
  - APP_BASE_URL used for all signing URLs (not NEXT_PUBLIC_BASE_URL)
  - Audit event with metadata.signerEmail per signer in multi-signer path
affects: [15-03, 16-multi-signer-ui]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Promise.all over signers array for parallel token creation and email dispatch"
    - "Branch on doc.signers?.length > 0 for multi vs. legacy path"
    - "APP_BASE_URL (server-side env) instead of NEXT_PUBLIC_BASE_URL for signing URLs"

key-files:
  created: []
  modified:
    - teressa-copeland-homes/src/app/api/documents/[id]/send/route.ts

key-decisions:
  - "Kept Promise.all fail-fast behavior: if one signer email fails, entire send fails and agent retries (consistent with legacy behavior)"
  - "clientName omitted for multi-signer emails (DocumentSigner has email+color only); email template handles gracefully"
  - "Return NextResponse.json({ ok: true }) without expiresAt in multi-signer path (all tokens same 72h TTL anyway)"

patterns-established:
  - "Multi-signer branch: doc.signers && (doc.signers as DocumentSigner[]).length > 0"
  - "Legacy fallback: resolve clientId = doc.assignedClientId ?? doc.clientId, same as before"

requirements-completed: [MSIGN-05, MSIGN-06]

# Metrics
duration: 5min
completed: 2026-04-03
---

# Phase 15 Plan 02: Multi-Signer Send Route Summary

**Send route rewritten to loop over doc.signers, create one JWT per signer with signerEmail, and dispatch all emails in parallel via Promise.all — with full legacy fallback when signers is null.**

## Performance

- **Duration:** ~5 min
- **Started:** 2026-04-03T00:00:00Z
- **Completed:** 2026-04-03T00:05:00Z
- **Tasks:** 1
- **Files modified:** 1

## Accomplishments

- Multi-signer path: `doc.signers` loop calls `createSigningToken(doc.id, signer.email)` for each signer, dispatches all emails in parallel via `Promise.all`
- Legacy single-signer path preserved exactly: resolves `assignedClientId ?? clientId`, creates token without signerEmail, sends to client.name
- `NEXT_PUBLIC_BASE_URL` replaced with `APP_BASE_URL` (server-side env var) across both paths
- Per-signer audit events with `metadata.signerEmail` in multi-signer path
- `DocumentSigner` imported from schema for proper type casting

## Task Commits

1. **Task 1: Rewrite send route with multi-signer token loop and legacy fallback** - `7a04a4f` (feat)

**Plan metadata:** (pending)

## Files Created/Modified

- `teressa-copeland-homes/src/app/api/documents/[id]/send/route.ts` - Multi-signer token loop + legacy fallback, APP_BASE_URL, parallel email dispatch

## Decisions Made

- Kept `Promise.all` fail-fast: if one signer's email fails, entire send rolls back; agent retries. Consistent with existing single-signer pattern.
- Omitted `clientName` in multi-signer path — `DocumentSigner` only has `{ email, color }`, and the email template already handles undefined clientName gracefully.
- Returned `{ ok: true }` without `expiresAt` in multi-signer response (all tokens share the same 72h TTL).

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None — no new environment variables introduced. `APP_BASE_URL` was already referenced in Phase 15 context (Pitfall 5); update `.env` to add it if not already present.

## Next Phase Readiness

- Send route is ready; Plan 15-03 (GET/POST sign handler rewrites) can proceed
- `signingTokens.signerEmail` is now written at send time — GET handler can filter fields by it in 15-03

## Self-Check: PASSED

- `teressa-copeland-homes/src/app/api/documents/[id]/send/route.ts` — FOUND
- `.planning/phases/15-multi-signer-backend/15-02-SUMMARY.md` — FOUND
- Commit `7a04a4f` — FOUND

---
*Phase: 15-multi-signer-backend*
*Completed: 2026-04-03*