action sendgrid_get_contactdb_custom_fields {
  label: "Retrieve all custom fields"
  description: "**This endpoint allows you to retrieve all custom fields.**"
  provider: sendgrid
  method: GET
  path: "/contactdb/custom_fields"
  encoding: json
  output: {
    type: "object"
    required: ["custom_fields"]
    properties: {
      custom_fields: {
        type: "array"
        items: {
          type: "object"
        }
      }
    }
  }
}