From HEXONET Wiki
The ActivateDomainTransfer command is used to approve or reject a domain transfer which requires the active participation of the registrar or repository owner (e.g. all gTLDs).
As soon as a gLTD transfer is initiated, our system sends a FOA email to the registrant by default, which contains a confirmation link. This link leads to a whitelabeled site where the transfer can be activated. If a reseller or a customer with its own domain repository does not want to use this FOA email function, he needs to use ActivateDomainTransfer to confirm the transfer. The command can only be executed by registrars or RegistrarOC customers. If you are no repository owner, you have to submit the respective repository and trigger code.
(required) command = ActivateDomainTransfer domain = (DOMAIN) action = REQUEST | APPROVE | REJECT | DENY (optional) repository = <TEXT> trigger = <TEXT>
(required) code = (CODE) description = (DESCRIPTION)