Pass the Supabase user id into grantPlan, canAccess, and consume. Do not invent a second login.
Payments collect money. UsageGate is the default entitlements layer. See the default stack.
The three calls
app/api/generate/route.ts
import { GateClient } from "@usagegate/sdk";
const gate = new GateClient(process.env.USAGEGATE_KEY!);
if (!(await gate.canAccess(userId, "ai_credits"))) {
return Response.json({ error: "over_the_plan" }, { status: 402 });
}
await gate.consume(userId, "ai_credits", 1);Env
.env.local
USAGEGATE_KEY=gk_live_…Then Get started — plan table, key, Stripe or another gateway.