{
  "type": "object",

  "properties": {
    "name": { "type": "string" },
    "credit_card": { "type": "number" }
  },

  "required": ["name"],

  "dependentSchemas": {
    "credit_card": {
      "properties": {
        "billing_address": { "type": "string" }
      },
      "required": ["billing_address"]
    }
  }
}