Feature: Channels

Channels are the communication surfaces through which a client team contacts their assigned Specialist persona. Each inbound message is normalized and routed into the conversation system regardless of source channel. Channel routing is one direction: inbound from the client, outbound from the Specialist (operated by Humanity Protocol's Expert + AI agent team).

⚠️ Historical audit context — see archived audit archive/MVP_CLIENT_CHANNELS_AUDIT_2026-05-22.md for the full readiness PM-cut snapshot from 2026-05-22. The headline finding (outbound dispatch broken on non-email channels) has since been resolved by PR #567 (ChannelDispatcherService); #576 / PR #621 closed the auto-respond mirror. Inbound and outbound media now flow end-to-end on Email/WhatsApp/Slack/Telegram via DispatchExpertReplyParams.attachments (#669 closes #559). Telegram signature verification fix landed in fix(security): correct JWT expiry docs and fix Telegram webhook auth (commit 080f458). Read the status table below with these caveats.

Channel Overview

Channel	Status	Auth Method	Notes
Email	✅ Live (Gmail API + DWD; CF Worker fallback during 2-week soak)	Gmail API polling via cron + Resend (transactional only)	2026-06-05 cutover (#1722, closes #1060): inbound now comes via Gmail API polling (`/30 * * * `) against per-OSA Workspace mailboxes; outbound replies are sent from the Specialist mailbox via DWD service-account impersonation* (single GCP service account, no per-OSA OAuth tokens). Cloudflare Worker remains as fallback during a 2-week prod soak — tracking issues #1440, #1441 stay open until retirement. See three-system overview below + Long-Term Plan section.
WhatsApp	✅ Live (Twilio)	HMAC-SHA1 (Twilio sig)	One inbound number per environment (`WHATSAPP_PHONE_NUMBER`); all orgs on the env share it. Sender identity (which org a phone belongs to) is established by self-service pairing codes (`whatsapp_linked_numbers`). Open: identity attribution bug #677 (P0).
Slack	✅ Live (Connect flow + manifest paste)	HMAC-SHA256 (per-org `signing_secret` from `integration_credentials`)	Connect flow flipped Coming-Soon → Available in #816 (closes #706). Manifest suggester at `/client/admin/channels/slack` via `GET /orgs/:orgId/channels/slack/manifest` (#1034). Inbound now lives in `SlackModule` (`api/src/channels/slack/`) per #1212/#1158. Per-org `signing_secret` + `bot_token` resolved via `integration_credentials`; env-var fallback is dev-only / disallowed in production (#1219, BLK-004).
Telegram	✅ Live	HMAC-SHA256 secret token
Web (widget)	✅ Live (embeddable)	Visitor JWT via `POST /public/widget/session` (24h TTL)	Embeddable customer-facing chat widget (`channel: "web"`). Standalone JS bundle a client embeds on their own site; visitors chat with their Specialist over REST + Socket.IO. Originally PR #926 (closes #43). See Web (embeddable widget) below, the feature spec, and the embed integration guide.
Teams	⚠️ Stub	Bot Framework	Needs credentials (#122)
WeChat	⚠️ Stub	App secret	XML parsing not yet implemented

Config scope on `/client/settings/channels` (org-level vs per-user)

The client Channels settings page is an org-level surface: every role that can access it (org_role owner/admin, plus superadmin) sees the same configuration, because the data is scoped by org_id — one config per org, not per user.

Section	Backend scope	Same for all roles?
Integrations (Slack / Email / Teams credentials)	`WHERE org_id` (`integrations/credentials/credentials.service.ts` `findAll`)	✅ org-level
Email whitelist	`WHERE org_id` (`organizations.service.ts` `getEmailWhitelist`)	✅ org-level
Slack install status	`WHERE org_id + type` (`channels/slack` OAuth status)	✅ org-level
WhatsApp linked numbers	`WHERE user_id` (`whatsapp-pairing.service.ts` `listForUser`)	❌ per-user (by design)

WhatsApp linked numbers are per-user, not org-level — intentionally. A WhatsApp link binds an individual's phone to the org's WhatsApp channel (whatsapp_linked_numbers carries both user_id and org_id, but GET /whatsapp/linked-numbers filters by the caller's user_id). So two admins of the same org can legitimately see different WhatsApp link lists (each sees their own). This is expected — personal data surfaced on the org settings page, not an org-level config inconsistency. Everything else on the page is org-scoped and identical across roles.

Email

Overview

h.work uses three distinct email systems. Do not confuse them.

System	Purpose	Provider	Who configures
Transactional	Invites, notifications, OTPs	Resend (`RESEND_API_KEY`)	HP internal
Specialist inbound (primary, 2026-06-05+)	Clients email `bob@`{HWORK_DOMAIN}``	Gmail API polling + DWD (System 4 below)	HP infra
Specialist inbound (fallback during 2-week soak)	same	Cloudflare Email Routing → webhook (System 2 below; tracking #1441)	HP infra
Expert personal	HP staff mailboxes (`david@ex.`{HWORK_DOMAIN}``)	Google Workspace	HP IT

2026-06-05 status: System 4 (Gmail API polling + DWD impersonation) shipped via PR #1722 and is now the primary inbound + outbound path for Specialist email. System 2 (Cloudflare Email Routing) remains as a fallback during a 2-week prod soak; #1441 tracks the final decommission. The Sytem 2 description below is preserved for the soak window — read System 4 first.

System 1 — Transactional Email (Resend)

Used for platform-generated emails: onboarding invites, OTP codes, welcome emails, AM completion notifications.

Provider: Resend (RESEND_API_KEY env var, already set in Railway)
From address: h.work <onboarding@h852.work> (staging) → onboarding@h.work once domain is verified in Resend
Code: api/src/email/email.service.ts (EmailService)
Pending: h.work domain needs to be verified in Resend dashboard for production use

System 2 — Specialist Inbound Email (Cloudflare → Webhook → Resend)

⚠️ Current implementation (MVP). This system treats the Specialist email as a lightweight routing alias. The long-term plan is to replace this with full Google Workspace identities (see Long-Term Plan: Google Workspace Identities below).

Used when clients email their assigned Specialist (bob@h.work) to start or continue a conversation.

Architecture:

Client email → bob@h.work (Cloudflare MX record on h.work)
                    │
                    ▼
         Cloudflare Email Routing
         (forward rule: *@h.work → /channels/email/inbound)
                    │
                    ▼
         POST /channels/email/inbound  (our webhook)
                    │
                    ▼
         ConversationsService.findOrCreateByChannel()
                    │
                    ▼
         Expert queue for review
                    │
                    ▼
         Expert approves → Resend API sends reply from bob@h.work (DKIM)

Key details:

Specialist email is a routing alias — not a real mailbox; Cloudflare routes inbound, Resend sends outbound
Sender authorization is two-tier: org membership is the primary check (the FROM address must belong to a user with a row in org_memberships for one of the Specialist's orgs); the legacy email_whitelists table is consulted only as a fallback for senders without a portal account (e.g. personal addresses)
Unknown senders receive a one-shot auto-reply ("This specialist inbox is for registered users only…") sent from the Specialist's own routing address so threading visually matches
Reply threading via In-Reply-To header — subsequent emails attach to existing conversation
Customer ID is deterministic: email:<from_address>
Outbound replies sent via Resend API, DKIM-signed as the Specialist routing address
Returns 200 immediately; processing is async (setImmediate)
NOT SendGrid — old code used SendGrid Inbound Parse; this has been replaced with Cloudflare Email Routing + Resend
All inbound/outbound email events logged to email_audit_log table
Per-subject threading via In-Reply-To; channel_message_id used for dedup

Setup requirements (HP infra):

Requirement	Details
Cloudflare Email Routing	Enable on `{HWORK_DOMAIN}` in Cloudflare dashboard
Cloudflare Worker	Deploy relay worker (see `docs/ops/EMAIL-CHANNEL-SETUP.md`)
Forward rule	`*@`{HWORK_DOMAIN}`` → Cloudflare Worker → `POST /channels/email/inbound`
MX record	Cloudflare sets automatically when Email Routing is enabled
Domain in Resend	Verify `{HWORK_DOMAIN}` in Resend dashboard for DKIM on outbound replies

Per-org credentials (stored in integration_credentials table, optional override):

Key	Description
`resend_api_key`	Resend API key for outbound (falls back to `RESEND_API_KEY` env var)
`from_email`	Specialist's routing address (e.g. `bob@h.work`)

System 3 — Expert Personal Email (Google Workspace)

HP staff (david@ex.h.work) have personal mailboxes via Google Workspace on the ex.h.work subdomain.

These are NOT routed through the platform
Expert responses to clients always go out as the Specialist address (bob@h.work), never from david@ex.h.work
HP IT manages Google Workspace externally; no platform code involved

System 4 — Gmail API inbound polling (per-OSA Workspace mailboxes) — #1722

2026-06-05 status: Gmail API polling shipped via PR #1722 (commit d8333558, closes #1060). This supersedes the original Pub/Sub design (#1432) and is now the primary inbound path. The Cloudflare relay (System 2) remains as a fallback during a 2-week prod soak; tracking issues #1440 and #1441 stay open until retirement.

For OSAs that have a provisioned Google Workspace mailbox, inbound email is fetched via the Gmail API on a polling cron schedule (*/30 * * * * * on Railway dev — every 30 seconds). The earlier Pub/Sub push design was dropped in favour of pull-mode polling for operational simplicity (no webhook to maintain, no Pub/Sub topic lifecycle, idempotent on retry).

Architecture:

Client email → {firstname}.{org-slug}@h.work (real Gmail mailbox)
                    │
                    ▼
         Gmail mailbox accumulates messages
                    │
                    ▼
         Railway cron (*/30 * * * * *) → GmailIngestCron
                    │  iterates over provisioned OSAs
                    │  GCP service account (DWD) impersonates each OSA user
                    │  Gmail API users.messages.list (q: newer than last historyId)
                    │  users.messages.get for each new message
                    ▼
         ConversationsService.findOrCreateByChannel()

Relationship to System 2 (Cloudflare): Gmail API polling is the primary inbound path for provisioned OSAs; the Cloudflare relay remains as a fallback during the 2-week soak and for un-provisioned OSAs. Routing is decided by org_specialist_assignments.gsuite_status — provisioned OSAs use polling, others fall through to Cloudflare.

Follow-ups filed 2026-06-06: #2064 (RFC 2822 Message-ID handling), #2065 (historyId observability).

Long-Term Plan: Google Workspace Identities

Status (2026-06-05): ✅ SHIPPED — DWD single-SA impersonation live (PR #1722, commit d8333558, closes #1060). Inbound = Gmail API polling cron; outbound = Specialist mailbox send-as via DWD impersonation. Per-OSA OAuth tokens (ADR-0002 Phase 2) are deprecated — OAuthTokenService is no longer in the dispatch hot path; a single GCP service account with domain-wide delegation now impersonates each OSA mailbox. Cloudflare relay (System 2) remains as fallback during the 2-week prod soak.

Decision: Each Org × Specialist Assignment (OSA) is provisioned a real Google Workspace user. The alias format is {firstname}.{org-slug}@{HWORK_DOMAIN} (note: not bob@h.work — this gives every (Org, Specialist) pair its own Workspace identity). Specialists become fully autonomous identities that the runtime can operate programmatically via a single platform-owned service account with DWD.

What shipped (2026-06-05, PR #1722 supersedes ADR-0002 Phase 2):

Component	PR	Description
Gmail API polling cron	#1722	`/30 * * * *` cron fetches new messages per provisioned OSA via DWD impersonation (replaces Pub/Sub design from #1432)
Outbound via DWD impersonation	#1722	`ChannelDispatcherService` sends Specialist replies through Gmail API as the OSA user — no per-OSA OAuth tokens involved
`WorkspaceProvisioningProcessor`	#1076	BullMQ worker that drives Admin Directory provisioning + lifecycle (still current)
OSA Gsuite lifecycle schema	#1065	`org_specialist_assignments.email_alias`, `workspace_user_id`, `gsuite_status`
`WorkspaceLifecycleModule`	#1074	NestJS module wiring the above
`assignSpecialist` provisioning hook	#1089	`OrganizationsService.assignSpecialist` enqueues a provisioning job
Specialist Email field dropped from Create form	#1097	The catalog Specialist no longer carries an Email field — the alias is per-assignment, not per-catalog-Specialist
~~`OAuthTokenService`~~ (deprecated)	~~#1079~~	Per-OSA OAuth token store — superseded by DWD impersonation in #1722; no longer in the dispatch path
~~Outbound Gmail Send via per-OSA OAuth~~ (replaced)	~~#1095~~	Replaced by DWD impersonation in #1722

Architecture (live):

GCP Service Account (single, platform-owned)
  + domain-wide delegation on h.work Workspace
        │
        ├─ impersonate {firstname}.{org-slug}@h.work → Gmail API (polling + send)
        ├─ impersonate {firstname}.{org-slug}@h.work → Calendar API (create events, freebusy, Meet links)
        ├─ impersonate {firstname}.{org-slug}@h.work → Drive API (share files, manage folders)
        │
        └─ Admin Directory API (no impersonation needed)
              ├─ POST /admin/directory/v1/users  ← WorkspaceProvisioningProcessor on assignSpecialist
              └─ DELETE /admin/directory/v1/users/{key}  ← on OSA removal

Key properties (as shipped 2026-06-05):

Single service account JSON key in Railway env — no per-OSA OAuth tokens stored or refreshed at runtime
Domain-wide delegation grants set once in the Google Admin Console by HP IT
All Gmail/Calendar/Drive API calls impersonate the target per-OSA Workspace user via DWD
Provisioning triggered from OrganizationsService.assignSpecialist → enqueues a WORKSPACE_JOB_CREATE job (#1076/#1089)
Inbound: Gmail API polling cron (*/30 * * * * *); Cloudflare relay is the fallback during 2-week soak
Outbound: Gmail API send-as the per-OSA user via DWD; Resend is not used for Specialist conversation outbound (Resend remains only for invites/onboarding/transactional via email/email.service.ts)
Cost: ~$6/user/month (Google Workspace Business Starter). Licences scale with active OSA count

What stays the same:

Outbound always from a Specialist-class address — a real per-OSA Gmail mailbox via DWD impersonation (Resend is not used for Specialist outbound)
Persona integrity — clients still only see the Specialist alias, never the Expert's personal address
email_audit_log table continues to log all events

Sender Authorization

The inbound handler checks senders in this order:

Org membership (primary): join org_memberships to users on LOWER(users.email) = <FROM> and org_id IN (<specialist's orgs>). Most users — anyone with a portal login — are authorized this way without any extra setup.
email_whitelists exact email match (fallback): for users without a portal account who still need to email in.
email_whitelists domain match (fallback): wildcard authorization for an entire corporate domain.
No match → unknown sender: auto-reply "This specialist inbox is for registered users only…" from the Specialist's address, then drop. Logged to email_audit_log with action=auto-replied:unknown_sender.

Whitelist Management API

GET /onboarding/:token/whitelist — list entries
POST /onboarding/:token/whitelist — add entry (during onboarding)
DELETE /onboarding/:token/whitelist/:id — remove entry
Default: empty. Most orgs no longer need any whitelist entries — invited team members are authorized via org_memberships. Add entries only for senders who don't have portal logins.

WhatsApp is delivered via one Twilio number per environment (staging has its own number, production has its own). All clients on the env share that single inbound number; the Specialist/persona identity (Bob, Nova, etc.) is carried entirely at the conversation/Specialist layer, not by the dialled phone number. Sender→org identity is established at runtime via self-service pairing codes generated from the client portal.

Single-Number Model

Each environment has exactly one inbound WhatsApp number, configured via the WHATSAPP_PHONE_NUMBER env var. The platform looks up which org a message belongs to by the sender's phone (From) via whatsapp_linked_numbers, never by the receiving number (To). One number can therefore serve every org on the env.

Outbound replies always go from the same number that received the message (i.e. WHATSAPP_PHONE_NUMBER).

Legacy: the whatsapp_number_pool table and the per-Specialist pool-assignment flow were the v1 design. They are retained for back-compat but no longer required for routing — getOrgWhatsAppNumber() reads WHATSAPP_PHONE_NUMBER directly.

Pairing Code Flow (canonical sender onboarding)

User signs into the portal → Settings → WhatsApp (/client/settings/whatsapp/).
Dashboard generates a one-time HW-XXXX code (15-minute TTL, copy + refresh buttons, live countdown). Stored in whatsapp_pairing_codes with userId + orgId.
User texts the code to the env's WhatsApp number on WhatsApp.
Inbound webhook detects the HW-XXXX pattern, consumes the code, and creates a row in whatsapp_linked_numbers (userId, orgId, phoneE164). A confirmation reply "Connected to {OrgName}" is sent.
Future messages from that phone route automatically to the user's org conversation.
The same Settings page lists linked numbers and lets the user unlink them.

Constraints:

One phone ↔ one org max. Re-pairing the same phone to a different org is rejected with a "you're already connected, unlink at /client/settings/profile" reply, and the new code is not burned.
A user may link multiple phones to the same org (e.g. personal + work).
Invalid / expired / already-used codes get a "not recognised, generate a new one from the dashboard" reply; the code in the message is ignored, not consumed.

Inbound Routing Priority

The inbound handler (routeTwilioWhatsApp in api/src/channels/channels.controller.ts) tries these in order:

Pairing-code message — if the body matches ^HW-[A-Z0-9]{4}$ (case-insensitive) → consume code + reply confirmation (or rejection per the rules above). Checked first so a user can re-pair even if already linked.
whatsapp_linked_numbers lookup on From → route to the linked org's conversation.
whatsapp_sender_whitelist lookup (To + From) → legacy fallback for orgs that pre-date the pairing flow.
Unknown sender → auto-reply pointing to the dashboard at https://app.{HWORK_DOMAIN}/client/settings/profile (rate-limited once per 24h per sender via Redis).

Architecture

Inbound WhatsApp message
      │
      ▼
WhatsApp Servers (Meta)
      │
      ▼
Twilio WhatsApp Gateway
      │ POST /channels/whatsapp/inbound
      │ X-Twilio-Signature (HMAC-SHA1)
      ▼
humanwork-api (NestJS)
      │ 1. Verify Twilio HMAC-SHA1 signature
      │ 2. Deduplicate via Redis (MessageSid, 1-hour TTL)
      │ 3. Match against routing priority (pairing code → linked → whitelist → unknown)
      │ 4. For pairing codes: write whatsapp_linked_numbers, mark code used
      │ 5. For known senders: dispatch to ConversationsService / ExpertQueue
      ▼
ConversationsService → ExpertQueue

Tables

Table	Purpose
`whatsapp_linked_numbers`	Pairing result: `(userId, orgId, phoneE164)` — the canonical routing key
`whatsapp_pairing_codes`	Live `HW-XXXX` codes with TTL, `userId`, `orgId`
`whatsapp_number_pool`	Legacy. No longer required for routing; `WHATSAPP_PHONE_NUMBER` env var supersedes it. Admin endpoints remain for back-compat
`whatsapp_sender_whitelist`	Deprecated. Legacy routing fallback only. Do not configure for new orgs

Other Key Details

Outbound replies are sent via Twilio REST API from the same number that received the message (always WHATSAPP_PHONE_NUMBER for the env).
Webhook: POST /channels/whatsapp/inbound — Twilio delivers application/x-www-form-urlencoded payload.
Signature verification: HMAC-SHA1. TWILIO_AUTH_TOKEN (main account) is preferred, with TWILIO_SUBACCOUNT_TOKEN as fallback for subaccount-owned senders. The env's WhatsApp number lives on the main account, so verification typically succeeds against TWILIO_AUTH_TOKEN.

Configuration (Railway env vars)

Variable	Description
`WHATSAPP_PHONE_NUMBER`	E.164 inbound number for this env (one per env). All orgs share it
`TWILIO_ACCOUNT_SID`	Main account SID — used for outbound REST calls (WhatsApp senders are registered on the main account)
`TWILIO_API_KEY`	Main account API Key SID — used to authenticate outbound sends
`TWILIO_API_SECRET`	Main account API Key Secret — paired with `TWILIO_API_KEY`
`TWILIO_AUTH_TOKEN`	Main account Auth Token — preferred token for inbound signature verification
`TWILIO_SUBACCOUNT_SID`	Per-env subaccount SID
`TWILIO_SUBACCOUNT_TOKEN`	Per-env subaccount Auth Token — fallback signature verification when sender is owned by the subaccount
`TWILIO_WEBHOOK_BASE_URL`	Public base URL for this env (e.g. `https://api.h.work`)

For full setup, see docs/ops/TWILIO-SETUP-CHECKLIST.md.

Slack

Status

✅ Live (Connect flow + manifest paste). Per-org credentials are stored encrypted in integration_credentials; the env-var fallback (SLACK_SIGNING_SECRET, SLACK_BOT_TOKEN) is dev-only and disallowed in production (#1219, BLK-004).

Module location: api/src/channels/slack/{slack.controller,slack.service,slack-engagement.service,slack-search.service}.ts — extracted from channels.controller.ts in #1212 / #1158.
Client Connect card: /client/admin/channels/slack — flipped Coming-Soon → Available in #816 (closes #706).
Manifest suggester: GET /orgs/:orgId/channels/slack/manifest returns a paste-ready Slack App manifest scoped to the org's webhook base URL (#1034).
"Add to Slack" OAuth install: #1498 lands the OAuth-based install flow (one-click "Add to Slack" button + redirect handler that exchanges the code for a bot token and stores it in integration_credentials). Operational runbook: docs/runbooks/slack-oauth-install.md for the manifest paste flow vs. the OAuth install flow.
Mention-gated channel ingest: the Slack adapter only ingests channel messages that mention the bot; full-channel ingest is gated behind the slack_engaged_threads book-keeping. Off-mention chatter is dropped at the adapter (#818). Thread context is cached in channel_context_messages for the agent; an hourly retention sweep prunes inactive threads.

Architecture

Slack event (app_mention or message in an engaged thread)
      │
      ▼
POST /channels/slack/events   (SlackController, api/src/channels/slack/)
      │ HMAC-SHA256 signature verification using per-org signing_secret
      │ resolved from integration_credentials (SlackService.resolveOrgId)
      │ 5-minute replay window
      ▼
SlackEngagementService — decide ingest vs. drop (mention-gated)
      │
      ▼
ConversationsService.findOrCreateByChannel()
      │ customerId = "slack:{teamId}:{channelId}"
      ▼
Agent processes → response posted to Slack channel (per-OSA impersonation)

Returns 200 immediately (async processing)
Handles url_verification challenge for Slack App setup
Replay attack protection via X-Slack-Request-Timestamp
Outbound supports media attachments per #669; Slack outbound media is wired through ExpertReplyDto.attachments in #1318 (closes #1157) — see Reliability primitives below.

Configuration Keys (per-org, stored in `integration_credentials`)

Key	Description
`bot_token`	Slack Bot OAuth token (`xoxb-...`) — env var `SLACK_BOT_TOKEN` is dev-only fallback
`signing_secret`	From Slack App settings — env var `SLACK_SIGNING_SECRET` is dev-only fallback
`app_id`	Optional — for multi-app routing

Architecture

POST /channels/telegram/webhook — receives Bot API updates
Validates X-Telegram-Bot-Api-Secret-Token header (HMAC-SHA256)
Routes to conversation system

Configuration Keys

Key	Description
`bot_token`	Telegram Bot token
`webhook_secret`	Optional HMAC secret for webhook validation

Status: Live. Implemented in fix/issue7-telegram branch, merged to master.

The web channel (channel: "web") is an embeddable, customer-facing chat widget a client drops onto their own website. Unlike the other channels — which are inbound webhooks/polling against vendor APIs — this one runs in the visitor's browser and talks to the h.work API directly. It is the only channel where the end visitor is anonymous (no vendor-side identity) and is authenticated by a short-lived visitor JWT rather than a provider signature.

Architecture

Standalone JS bundle @humanwork/chat-widget (packages/chat-widget/), embedded via <script> on the client site.
POST /public/widget/session mints a 24h visitor JWT for { orgSlug, visitorId? } (@Public(), 30 req/min, wildcard CORS). Unknown org → 404; malformed visitorId → 400.
The widget then uses the standard conversation API as a client-role caller (GET/POST /conversations, GET /conversations/:id, POST /conversations/:id/messages) and the /notifications Socket.IO namespace for realtime (agent_message_sent, agent_typing, join_conversation/leave_conversation).
Responses are masked by ClientConversationViewInterceptor (#2353) so a visitor cannot distinguish a human Expert from the AI.

Auth Method

Layer	Mechanism
Session mint	`POST /public/widget/session` → JWT (`role: "client"`, `widgetVisitorId`, single-org `orgMemberships`, 24h TTL, #2925)
API calls	`Authorization: Bearer <visitor-jwt>`; auto-refresh near expiry, transparent re-mint on 401
Visitor identity	per-org UUID persisted in browser `localStorage` (`humanwork.chat.visitorId.{orgSlug}`)

Status: Live. Originally PR #926 (closes #43); session auth + realtime added since. Full details in the feature spec; embedding instructions (CORS/CSP, script tag, theming) in the embed integration guide.

Teams (Microsoft)

Stub implementation only. Bot Framework connector is wired but not tested.

POST /channels/teams/webhook — handler exists, marked // needs-testing

Status: NOT_STARTED (BLK-032). Requires Microsoft App registration + Bot Framework credentials.

WeChat

Stub implementation only.

GET /channels/wechat/webhook — verification challenge handler
POST /channels/wechat/webhook — inbound stub (XML parsing not implemented)

Status: NOT_STARTED (BLK-042, P3). Requires WeChat Official Account registration.

Channel Admin Endpoints

These endpoints provide operational visibility for org admins:

Endpoint	Description
`GET /orgs/:orgId/channels/status`	Health status for all configured channels
`GET /orgs/:orgId/channels/webhook-urls`	Exact webhook URLs to paste into channel dashboards

Integration Credentials Management

All per-org channel credentials are stored encrypted in integration_credentials (AES-256-GCM). API responses mask credential values (first 4 chars + ****).

Endpoint	Description
`POST /orgs/:orgId/integrations`	Create or upsert channel credentials
`GET /orgs/:orgId/integrations`	List integrations (masked)
`DELETE /orgs/:orgId/integrations/:id`	Remove integration
`POST /orgs/:orgId/integrations/:id/test`	Test connection (lightweight API call)

Reliability Primitives (cross-channel)

These primitives apply to all live channels (Email/WhatsApp/Slack/Telegram). They were factored out of the channel-specific code paths during the 2026-05 reliability sweep.

Primitive	Source	Description
`CircuitBreaker`	#848	Per-channel breaker that opens on consecutive transport failures; outbound dispatch fails fast while the breaker is open and emits a metric
Channel DLQ + retry worker	#850 (closes #744)	Failed inbound webhooks land in `channel_dead_letter`; the retry worker re-drives them with exponential backoff
Prometheus metrics	#1023 (closes #757)	DLQ depth, outbound BullMQ queue depth + failure rate, breaker state, dedup hits — all exported under `/metrics`
Outbound dispatch BullMQ queue	#936	Outbound expert replies route through a BullMQ queue instead of `setImmediate`; pod restarts no longer lose in-flight sends
DB-level dedup constraints	#929	Unique indexes on `(channel, channel_message_id)` enforce dedup at the database layer regardless of in-process Redis cache state
Per-channel outbound media	#669 (closes #559); #1318 wires Slack outbound attachments through `ExpertReplyDto` (closes #1157)	Email / WhatsApp / Slack / Telegram all accept `DispatchExpertReplyParams.attachments`; the channel adapter handles native attachment APIs (Slack `files.upload`, Twilio `MediaUrl`, Gmail multipart, etc.)

Roadmap

Channel	Timeline	Notes
WeChat	P3	Requires WeChat Official Account
Teams	P2	BLK-032 — needs Microsoft App registration + Bot Framework

Channel Overview​

Config scope on /client/settings/channels (org-level vs per-user)​

Email​

Overview​

System 1 — Transactional Email (Resend)​

System 2 — Specialist Inbound Email (Cloudflare → Webhook → Resend)​

System 3 — Expert Personal Email (Google Workspace)​

System 4 — Gmail API inbound polling (per-OSA Workspace mailboxes) — #1722​

Long-Term Plan: Google Workspace Identities​

Sender Authorization​

Whitelist Management API​

WhatsApp​

Single-Number Model​

Pairing Code Flow (canonical sender onboarding)​

Inbound Routing Priority​

Architecture​

Tables​

Other Key Details​

Configuration (Railway env vars)​

Slack​

Status​

Architecture​

Configuration Keys (per-org, stored in integration_credentials)​

Telegram​

Architecture​

Configuration Keys​

Web (embeddable widget)​

Architecture​

Auth Method​

Teams (Microsoft)​

WeChat​

Channel Admin Endpoints​

Integration Credentials Management​

Reliability Primitives (cross-channel)​

Roadmap​

Channel Overview

Config scope on `/client/settings/channels` (org-level vs per-user)

Email

Overview

System 1 — Transactional Email (Resend)

System 2 — Specialist Inbound Email (Cloudflare → Webhook → Resend)

System 3 — Expert Personal Email (Google Workspace)

System 4 — Gmail API inbound polling (per-OSA Workspace mailboxes) — #1722

Long-Term Plan: Google Workspace Identities

Sender Authorization

Whitelist Management API

WhatsApp

Single-Number Model

Pairing Code Flow (canonical sender onboarding)

Inbound Routing Priority

Architecture

Tables

Other Key Details

Configuration (Railway env vars)

Slack

Status

Architecture

Configuration Keys (per-org, stored in `integration_credentials`)

Telegram

Architecture

Configuration Keys

Web (embeddable widget)

Architecture

Auth Method

Teams (Microsoft)

WeChat

Channel Admin Endpoints

Integration Credentials Management

Reliability Primitives (cross-channel)

Roadmap