Accepts the invitation to be monitored by a GuardDuty administrator account.
See https://www.paws-r-sdk.com/docs/guardduty_accept_invitation/ for full documentation.
guardduty_accept_invitation(DetectorId, MasterId, InvitationId)
[required] The unique ID of the detector of the GuardDuty member account.
[required] The account ID of the GuardDuty administrator account whose invitation you're accepting.
[required] The value that is used to validate the administrator account to the member account.