Returns the percentage of user retention over the last 30 days

{
  "type": "object",
  "properties": {
    "apiKey": {
      "type": "string"
    },
    "stage": {
      "type": "string",
      "enum": [
        "LIVE",
        "PREVIEW"
      ]
    }
  },
  "required": [
    "apiKey",
    "stage"
  ],
  "additionalProperties": false
}