curl --request POST \
  --url https://{cluster}.voucherify.io/v1/validation-rules \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '
{
  "name": "Set of Validation Rules",
  "error": {
    "message": "Your order does not meet at least one of the required criteria."
  },
  "applicable_to": {
    "included_all": false,
    "excluded": [
      {
        "object": "product",
        "id": "prod_0bae45ffc7003ffc52",
        "source_id": "second_product",
        "effect": "APPLY_TO_EVERY"
      }
    ],
    "included": [
      {
        "object": "product",
        "id": "prod_0b72b00ffed198e344",
        "source_id": null,
        "effect": "APPLY_TO_MOST_EXPENSIVE",
        "quantity_limit": 1
      },
      {
        "object": "products_collection",
        "id": "pc_4ndRXAsTOzwSdHcQcxf489uU",
        "source_id": null,
        "effect": "APPLY_TO_EVERY",
        "quantity_limit": 5
      }
    ]
  },
  "rules": {
    "1": {
      "name": "order.metadata",
      "property": "location",
      "rules": {},
      "conditions": {
        "$is": [
          "Santorini"
        ]
      },
      "error": {
        "message": "Your order must be placed at one of our Santorini shops."
      }
    },
    "2": {
      "name": "custom_event.metadata",
      "property": "test",
      "rules": {},
      "conditions": {
        "$greater_than_or_equal": [
          1
        ]
      }
    },
    "3": {
      "name": "order.items.every",
      "rules": {
        "1": {
          "name": "order.items.metadata",
          "property": "test",
          "rules": {},
          "conditions": {
            "$greater_than_or_equal": [
              1
            ]
          }
        }
      },
      "conditions": {
        "$is": [
          {
            "id": "<PROD_ID>",
            "effect": "APPLY_TO_EVERY",
            "object": "product",
            "source_id": "<SOURCE_ID>"
          }
        ]
      }
    },
    "logic": "1 or 2"
  }
}
'

{
  "id": "val_eR1c41hu0vUU",
  "name": "Business Validation Rule",
  "rules": {
    "1": {
      "name": "string",
      "property": "string",
      "conditions": {
        "$one_of_voucherify_conditions": [
          "string"
        ]
      },
      "rules": {
        "1": {
          "name": "string",
          "property": "string",
          "conditions": {},
          "rules": {}
        },
        "logic": "string"
      },
      "error": {
        "message": "string"
      }
    },
    "logic": "(1 and 2) and (3)"
  },
  "error": {
    "message": "string"
  },
  "applicable_to": {
    "excluded": [
      {
        "object": "product",
        "id": "string",
        "source_id": "string",
        "effect": "APPLY_TO_EVERY"
      }
    ],
    "included": [
      {
        "object": "product",
        "id": "string",
        "source_id": "string",
        "effect": "APPLY_TO_EVERY",
        "quantity_limit": 0
      }
    ],
    "included_all": true
  },
  "created_at": "2022-03-23T07:44:00.444Z",
  "updated_at": "2022-04-26T08:35:54.960Z",
  "type": "basic",
  "context_type": "earning_rule.order.paid",
  "object": "validation_rules"
}