title: Authenticate
description: Check-in protocol authenticate request keys.
payload:
  requesttype: Authenticate
  supportedOS:
    iOS:
      introduced: '4.0'
      supervised: false
      requiresdep: false
      sharedipad:
        mode: allowed
        devicechannel: true
        userchannel: false
      userenrollment:
        mode: allowed
    macOS:
      introduced: '10.7'
      devicechannel: true
      userchannel: false
      requiresdep: false
      userenrollment:
        mode: allowed
    tvOS:
      introduced: '10.2'
      supervised: false
  content: Check-in protocol authenticate request and response.
payloadkeys:
- key: DeviceName
  supportedOS:
    iOS:
      introduced: n/a
    tvOS:
      introduced: n/a
  type: <string>
  presence: required
  content: The device's name.
- key: ModelName
  supportedOS:
    iOS:
      introduced: n/a
    tvOS:
      introduced: n/a
  type: <string>
  presence: required
  content: The device's model name.
- key: Model
  supportedOS:
    iOS:
      introduced: n/a
    tvOS:
      introduced: n/a
  type: <string>
  presence: required
  content: The device's model.
- key: MessageType
  type: <string>
  presence: required
  rangelist:
  - Authenticate
  content: The message type, which must have a value of 'Authenticate'.
- key: Topic
  type: <string>
  presence: required
  content: The topic to which the device subscribes.
- key: UDID
  supportedOS:
    iOS:
      userenrollment:
        mode: forbidden
    macOS:
      userenrollment:
        mode: forbidden
  type: <string>
  presence: required
  content: The device's UDID (Unique Device ID).
- key: EnrollmentID
  supportedOS:
    iOS:
      introduced: '13.0'
      userenrollment:
        mode: required
    macOS:
      introduced: '10.15'
      userenrollment:
        mode: required
    tvOS:
      introduced: n/a
  type: <string>
  presence: required
  content: The per-enrollment identifier for the device. Available in macOS 10.15
    and iOS 13.0 and later.
- key: OSVersion
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
  type: <string>
  presence: optional
  content: The device's OS version.
- key: BuildVersion
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
  type: <string>
  presence: optional
  content: The device's build version.
- key: ProductName
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
  type: <string>
  presence: optional
  content: The device's product name ('iPhone3,1').
- key: SerialNumber
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
      userenrollment:
        mode: forbidden
    macOS:
      accessrights: AllowQueryDeviceInformation
      userenrollment:
        mode: forbidden
  type: <string>
  presence: optional
  content: The device's serial number.
- key: IMEI
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
      userenrollment:
        mode: forbidden
    macOS:
      introduced: n/a
    tvOS:
      introduced: n/a
  type: <string>
  presence: optional
  content: The device's IMEI (International Mobile Station Equipment Identity).
- key: MEID
  supportedOS:
    iOS:
      introduced: '9.0'
      accessrights: AllowQueryDeviceInformation
      userenrollment:
        mode: forbidden
    macOS:
      introduced: n/a
    tvOS:
      introduced: n/a
  type: <string>
  presence: optional
  content: The device's MEID (Mobile Equipment Identifier).