{
  "success": true,
  "multipassUrl": "/",
  "customer": {
    "idmId": "string",
    "shopifyId": "gid://shopify/Customer/123",
    "cardNumber": "string",
    "score": 150,
    "cartId": "gid://shopify/Cart/789"
  },
  "cartMerged": true,
  "error": null
}