One schema for every system your customers already run. Your users connect their own accounts inside your product — you never touch their credentials.
curl https://luminous-secretary--be2d7ade.ammanueldesta.workers.dev/api/sync/hubspot \ -H "X-Api-Key: YOUR_KEY" \ -H "X-HubSpot-Token: CUSTOMER_HUBSPOT_TOKEN"
Returns normalized JSON — no write to any table, no data stored. Your key gates access; your customer's own token authorizes the read.