Simplification is not a smaller codebase. It is fewer places where a thing can be wrong. A product with twelve vendors has twelve places; a product with one platform account and its own code has two, and one of them is yours.
Write only what is yours
Sign-in is not yours. Plans and entitlements are not yours. Taking a payment is not yours. A slot calendar is not yours. Verifying an IBAN, converting a currency, rendering a PDF, reading a Shopify order — none of it is yours. What is yours is the thing the customer pays for, and it is usually a few hundred lines that arrange the rest. Everything else should be a call.
One account, one wallet, one ledger
The platform's account is the identity your users sign in with and the consent they give to connect their own tools. The wallet is what every call is debited from, only on success. The ledger is the one place where "what did last month cost, and on what" has an answer by endpoint. When a product's spending is one query away, decisions get easier.
Extend without a server
When the catalogue does not have the exact call you need, a custom endpoint is a JavaScript function at a URL, sandboxed, billed like the rest. Three calls become one. A partner's odd shape becomes a slug. No deploy.
Leave the door open
Customers want the same capabilities in n8n, Make, Zapier and their agent. The export endpoint generates the node packages; the Zapier group handles hooks and batches; the MCP server hands the catalogue to any agent as tools. The product does not have to build the doors, only to leave them open.
That is the whole strategy: one door in, one ledger, your own code in the middle. The developer page is the map.