List join links

{
  "items": [
    {
      "id": "5571",
      "slug": "northwind-advertisers",
      "joinPath": "/join/northwind-advertisers",
      "sellerCustomerId": 318,
      "storefrontId": 4012,
      "role": "BUYER",
      "posture": "prepay",
      "approvalPolicy": "manual_approve",
      "active": true,
      "uses": 12,
      "maxUses": 250,
      "expiresAt": "2026-12-31T23:59:59.000Z",
      "revokedAt": null,
      "createdAt": "2026-06-14T18:22:10.441Z",
      "updatedAt": "2026-06-14T18:22:10.441Z"
    }
  ],
  "total": 1
}