Update a subscriber Request

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/convertkit/main/json-schema/update_a_subscriber_request.json",
  "title": "Update a subscriber Request",
  "x-tag": "Subscribers",
  "type": "object",
  "properties": {
    "first_name": {
      "type": "string",
      "nullable": true
    },
    "email_address": {
      "type": "string"
    },
    "fields": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      },
      "description": "Custom field values keyed by the custom field's `key` (e.g. `last_name`, not `Last Name`). Unknown keys are ignored and reported in the response `warnings` array."
    }
  },
  "required": [
    "email_address"
  ]
}