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# Lets expand on this into a dev plan and for starters we are going to use a shared server, with c-panel and node.js app install capabilities, also has database capabilities and domain and dns management:

M — OAuth Account Connections: Build an "Integrations" settings panel (the settings route is already scaffolded ). Let clients connect Google Workspace, Meta Business, Stripe, QuickBooks, Mailchimp, etc. via OAuth2 token storage

For Phase M on a shared cPanel server, design OAuth integrations as a **single, generic “Connections” engine** in your Node backend, surfaced through an “Integrations” settings panel in the app.

***

## 1. Scope and priorities

Start with 2–3 providers that are immediately useful for AIISTECH’s business-automation story and low-friction to implement:

- Google Workspace (Gmail/Calendar/Drive scopes later).[^1]
- Stripe (for account-level access, separate from your platform’s own Stripe keys).[^2][^3]
- Mailchimp or QuickBooks as the first “external system” integration.[^4][^5]

All are standard OAuth 2.0 authorization code flows: redirect to provider, get `code`, exchange for access + refresh tokens, store tokens, and use them for API calls on behalf of the tenant.[^5][^4][^2]

***

## 2. Data model

Add tables for generic OAuth connections:

- `integrations`
    - `id`
    - `key` (e.g. `google_workspace`, `stripe_account`, `mailchimp`, `quickbooks`)
    - `name`
    - `category` (`crm`, `billing`, `email`, etc.)
    - `enabled` (feature flag)
    - timestamps
- `tenant_integrations`
    - `id`
    - `tenant_id`
    - `integration_id`
    - `status` (`connected`, `disconnected`, `error`)
    - `provider_account_id` (e.g. Google `sub`, Stripe account ID, QuickBooks realmId).[^6][^4][^2][^5]
    - `scopes` (string/JSON)
    - timestamps
- `oauth_tokens`
    - `id`
    - `tenant_integration_id`
    - `access_token` (encrypted at rest)
    - `refresh_token` (encrypted)
    - `expires_at`
    - `token_type`
    - `raw_response` (optional JSON)
    - timestamps

This lets you add providers incrementally without changing schema, and matches typical multi-tenant SaaS patterns where OAuth tokens are stored per-tenant, per-provider.[^7][^4][^5]

***

## 3. Backend OAuth engine (Node on cPanel)

Implement a **provider-agnostic flow**:

### Common endpoints

- `GET /api/integrations`
List available integrations and whether they’re connected for the current tenant.
- `POST /api/integrations/:key/connect`
Builds provider-specific authorization URL and redirects the user there (`302`).
- `GET /api/integrations/:key/callback`
Provider redirect URI; exchanges `code` for tokens, upserts `tenant_integrations` and `oauth_tokens`.
- `DELETE /api/integrations/:key`
Disconnect: mark status, optionally revoke tokens at provider.


### Provider specifics

All follow the same pattern as in docs:

- **Google Workspace**:
Configure OAuth consent in a single GCP project for your SaaS (external, production, appropriate scopes).[^8][^1]
Flow: redirect to `https://accounts.google.com/o/oauth2/v2/auth` with your `client_id`, scopes, `redirect_uri`. Exchange code at `https://oauth2.googleapis.com/token`. Store `access_token`, `refresh_token`, `expires_at`.
- **Stripe**:
Use Stripe’s OAuth 2.0 for Connect / account connections.[^3][^2]
Flow: redirect to Stripe OAuth authorize URL with your platform’s Stripe client ID; user authorizes; you receive `code`, exchange for tokens and Stripe account ID. Store Stripe account ID in `provider_account_id`.
- **Mailchimp**:
Follow Mailchimp’s OAuth guide example: redirect to `authorize_uri`, exchange code at `token` URL, call metadata endpoint to get datacenter prefix, then use access token + prefix for API calls.[^5]
- **QuickBooks**:
Use Intuit’s OAuth 2.0 guide: redirect to Intuit OAuth server, exchange code for tokens, store `realmId` (company ID) in `provider_account_id`.[^4][^6]

All four share the same **authorization-code + refresh token** mechanics.[^2][^4][^5]

***

## 4. Token lifecycle and security

Because you’re on shared hosting:

- Store client IDs/secrets in environment variables in cPanel (not in code or DB).
- Encrypt tokens in the database (at least symmetric encryption with a key in env vars).
- Implement a token refresh helper per provider:
    - Check `expires_at`; if expired or near expiry, call provider’s token endpoint with `grant_type=refresh_token`.[^4][^2][^5]
- For every integration API call:
    - Load tokens, refresh if needed, then call provider.
    - If refresh fails, mark `tenant_integrations.status='error'` and surface this in the UI.

This mirrors provider docs where they show the pattern: get authorization code → get tokens → refresh tokens when they expire → repeat.[^9][^2][^5][^4]

***

## 5. “Integrations” settings panel (frontend)

You already have a `settings` route scaffolded, so add an **Integrations** tab:

For each integration (Google, Stripe, Mailchimp, QuickBooks):

- Show card with:
    - Name, logo, short description.
    - Status pill (`Connected`, `Not connected`, `Error`).
    - “Connect” / “Reconnect” or “Disconnect” button.

UX:

- Clicking **Connect** → call `POST /api/integrations/google_workspace/connect` → backend responds with redirect URL → frontend redirects there.
- Provider completes flow and redirects user back to `/settings/integrations?provider=google_workspace&status=success`, where you show a success message and reload the list.

This matches the straightforward OAuth UX described in Mailchimp’s and Stripe’s OAuth guides: “user clicks link on your site, gets redirected to provider, then back with a code.”[^3][^2][^5]

***

## 6. Multi-tenant behavior

Per-tenant semantics:

- Use `tenant_id` from your auth/tenant middleware for all integration endpoints.
- One tenant can connect:
    - Zero or one Stripe account (for billing or payouts).
    - One Google Workspace domain (or per-user, later).
    - Zero or more Mailchimp/QuickBooks accounts if you want.

You can encode these rules in the `integrations` table and the UI (e.g., `max_connections_per_tenant`).

***

## 7. RBAC and auditing

Integrate with Phase F RBAC:

- Only users with `integrations.manage` permission can connect or disconnect integrations.
- All actions log to an `audit_log` or reuse your existing auth audit logger to record integration events (connect, disconnect, error).

***

## 8. Milestones

1. **M1 – Core engine \& Google**
    - Tables: `integrations`, `tenant_integrations`, `oauth_tokens`.
    - Generic connect/callback/disconnect endpoints.
    - Integrations panel UI.
    - Google Workspace connection as first provider.[^8][^1]
2. **M2 – Stripe account connection**
    - Add Stripe OAuth provider.
    - Store connected Stripe account ID in `provider_account_id`.[^2][^3]
3. **M3 – Mailchimp or QuickBooks**
    - Add one of them end-to-end (OAuth + test API call).[^5][^4]
4. **M4 – Error handling / UX polish**
    - Token refresh logic.
    - Clear error states and reconnection flow.

On your current shared-stack AIISTECH, this gets a robust, multi-provider, tenant-aware OAuth integration layer without needing extra infrastructure beyond your cPanel Node app and DB.

Which provider do you want to implement first (Google Workspace, Stripe, or something else)?
<span style="display:none">[^10][^11][^12][^13][^14][^15][^16][^17][^18][^19][^20][^21]</span>

<div align="center">⁂</div>

[^1]: https://developers.google.com/workspace/guides/configure-oauth-consent

[^2]: https://docs.stripe.com/stripe-apps/api-authentication/oauth

[^3]: https://docs.stripe.com/connect/oauth-standard-accounts

[^4]: https://developer.intuit.com/app/developer/qbpayments/docs/develop/authentication-and-authorization/oauth-2.0

[^5]: https://mailchimp.com/developer/marketing/guides/access-user-data-oauth-2/

[^6]: https://developer.intuit.com/app/developer/qbo/docs/develop/authentication-and-authorization/openid-connect

[^7]: https://community.n8n.io/t/multi-tenant-saas-google-nodes-how-to-use-per-user-oauth-tokens-dynamic-credentials/247612

[^8]: https://stackoverflow.com/questions/79064151/are-separate-google-workspace-oauth-clients-required-for-each-saas-tenant-for-ss

[^9]: https://docs.stripe.com/subscriptions

[^10]: https://github.com/isaacsanders/omniauth-stripe-connect

[^11]: https://gist.github.com/panozzaj/87d07cb246bf557a9ab67175898ad194

[^12]: https://github.com/intuit/oauth-rubyclient

[^13]: https://github.com/jerotheo/oauth2-mailchimp

[^14]: https://github.com/adamjstevenson/oauth-stripe-connect-php

[^15]: https://github.com/SAP/cloud-security-services-integration-library/issues/366

[^16]: https://github.com/ruckus/quickbooks-ruby/issues/389

[^17]: https://github.com/jerotheo/oauth2-mailchimp/blob/master/readme.md

[^18]: https://github.com/p2-inc/keycloak-idp-oauth2/blob/main/docs/stripe-connect-authenticator.md

[^19]: https://github.com/hashicorp/terraform-provider-google/issues/88

[^20]: https://www.webtoffee.com/docs/stripe-basic/switch-stripe-integration-oauth/

[^21]: https://docs.devart.com/dotconnect/mailchimp/ConnectingOAuth.html

