Detect paid plans from Autumn entitlement flags (#482)

src/client/features/billing/plan-detection.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from "vitest";
+import { AUTUMN_PAID_PLAN_FEATURE_ID } from "@/shared/billing";
+import { getCustomerPlanStatus } from "./plan-detection";
+
+describe("getCustomerPlanStatus", () => {
+  it("treats a customer without the paid entitlement as free", () => {
+    expect(getCustomerPlanStatus(undefined)).toBe("free");
+    expect(getCustomerPlanStatus({ flags: {} })).toBe("free");
+  });
+
+  it("treats any plan granting the paid entitlement as paid", () => {
+    expect(
+      getCustomerPlanStatus({
+        flags: {
+          [AUTUMN_PAID_PLAN_FEATURE_ID]: {
+            planId: "friends_and_family_2",
+          },
+        },
+      }),
+    ).toBe("paid");
+  });
+});

src/client/features/billing/plan-detection.ts

@@ -1,17 +1,9 @@
-import { AUTUMN_PAID_PLAN_ID } from "@/shared/billing";
+import { AUTUMN_PAID_PLAN_FEATURE_ID } from "@/shared/billing";
 
 export type PlanStatus = "free" | "paid";
 
 export function getCustomerPlanStatus(
-  customer:
-    | { subscriptions?: Array<{ planId: string; status: string }> }
-    | undefined,
+  customer: { flags?: Record<string, unknown> } | undefined,
 ): PlanStatus {
-  if (!customer?.subscriptions) return "free";
-
-  const hasActivePaid = customer.subscriptions.some(
-    (sub) => sub.planId === AUTUMN_PAID_PLAN_ID && sub.status === "active",
-  );
-
-  return hasActivePaid ? "paid" : "free";
+  return customer?.flags?.[AUTUMN_PAID_PLAN_FEATURE_ID] ? "paid" : "free";
 }