{
  "payload": {
    "export": "cart-validations-generate-run",
    "target": "cart.validations.generate.run",
    "input": {
      "shop": {
        "checkoutSnapshot": {
          "value": "{\"enforcement\":{\"mode\":\"all\"},\"schedulableProductIds\":[],\"horizonDate\":\"2026-12-31\",\"slots\":{\"loc_123|PICKUP|2026-08-25|540\":0},\"closedDates\":{}}"
        }
      },
      "cart": {
        "ddMethod": { "value": "PICKUP" },
        "ddDate": { "value": "2026-08-25" },
        "ddStartMin": { "value": "540" },
        "ddEndMin": { "value": "600" },
        "ddLocationId": { "value": "loc_123" },
        "lines": []
      }
    },
    "output": {
      "operations": [
        {
          "validationAdd": {
            "errors": [
              {
                "message": "The delivery slot you picked just filled up. Please choose another.",
                "target": "$.cart"
              }
            ]
          }
        }
      ]
    }
  }
}