Need Advice on Making an Automation · AI Automation Agency Hub

Need Advice on Making an Automation

I'm planning to build a white-label AI social media publishing system for my agency clients, and I'd love some advice from people who've already built something similar.

The idea

I already build websites and run Google Ads/Meta Ads for local businesses. Most of my clients also post daily on Instagram, Facebook, TikTok, and sometimes LinkedIn. Right now, they manually upload the same photos/videos and captions to every platform, which takes a lot of time.

I want to build a simple web app where the client only needs to:

Upload photos or videos
Write a caption (or let AI improve/generate it)
Select the platforms
Click Publish

Everything else should happen automatically in the background using n8n.

Planned architecture

Frontend (Lovable / Next.js / Replit)

↓

Webhook to n8n

↓

OpenAI (caption enhancement, hashtags, CTA)

↓

Publish to selected social platforms

↓

Save logs to database

↓

Return success to the frontend

The client never sees n8n—they only interact with a clean dashboard.

My biggest questions

What's the best way to let clients connect their social media accounts?

Instagram
Facebook
TikTok
LinkedIn
X
Google Business Profile

How does the OAuth flow usually work for a SaaS like this?
Where should I securely store access tokens and refresh tokens?
Does n8n handle token refresh automatically, or do I need to build that logic myself?
Would you recommend using n8n as the backend for production, or would you put another backend (Node.js, Supabase Edge Functions, etc.) between the frontend and n8n?
For agencies serving multiple clients, what's the best architecture for keeping each client's credentials and posts isolated?

If you've built a similar social media publishing tool or SaaS, I'd really appreciate hearing how you structured it and any lessons you learned along the way.

Thanks in advance!

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Need Advice on Making an Automation