chore: use js-auth into api

examples/nextjs/src/app/api/test/route.ts

@@ -0,0 +1,22 @@
+import { authenticate, jwtVerify } from "@commercelayer/js-auth"
+import { NextResponse, type NextRequest } from "next/server"
+
+export async function GET(_request: NextRequest) {
+  const auth = await authenticate('client_credentials', {
+    clientId: 'BISG8bb3GWpC8_D7Nt1SuWWdieS5bJq831A50LgB_Ig',
+    scope: 'market:id:KoaJYhMVVj'
+  })
+
+  const decodedJWT = await jwtVerify(auth.accessToken)
+
+  let slug: string
+
+  if (!('organization' in decodedJWT.payload)) {
+    throw new Error('A "sales_channel" token is required.')
+  }
+
+  return NextResponse.json({
+    from: 'api',
+    orgSlug: decodedJWT.payload.organization.slug
+  })
+}