Authorize customer spend before paid work runs.

1import { Unprice } from "@unprice/api"
2
3const unprice = new Unprice({
4  token: process.env.UNPRICE_TOKEN,
5  baseUrl: "https://api.unprice.dev",
6})
7
8// Once, at your own signup: subscribe the customer to a
9// plan. Unprice provisions the subscription and its
10// entitlements, then returns the id you store.
11const { result: signup } = await unprice.customers.signUp({
12  name: "Acme Inc.",
13  email: "[email protected]",
14  planSlug: "pro",
15  externalId: "user_123", // your id for this customer
16  successUrl: "https://your-app.com/welcome",
17  cancelUrl: "https://your-app.com/pricing",
18})
19
20// Every request after that: check before the paid
21// action runs.
22const { result, error } = await unprice.access.check({
23  customerId: signup.customerId,
24  featureSlug: "tokens",
25})
26
27if (error) {
28  console.error(error.message)
29  return
30}
31
32if (!result.allowed) {
33  // Denied in the request path — no cost was ever created.
34  throw new Error("Denied before paid usage ran")
35}
36
37// Allowed: run the paid action. The same decision
38// explains the invoice line later.