From HEXONET Wiki
The SetDomainRenewalMode command sets the Domain Renewal Mode used by the Renewal System.
SetDomainRenewalMode allows you to set the renewalmode on a per domain basis; the following modes are permitted:
AUTORENEW: the system pays the domain renewal internally if the domain has renewalmode AUTORENEW. Hence the PREPAIDPERIOD is increased.
AUTODELETE: the system will send a deletion command for the domain name on failure date
AUTOEXPIRE: the system let the domain expire on the so-called failure date, often this is equal to a deletion, but for some TLDs like .DE, another procedure apply (.de: "TRANSIT"; .at: "BILLWITHDRAW")
With the optional parameter
PERIOD you are able to set a .DE domain name to monthly renewal or back to yearly.
(required) command = SetDomainRenewalMode renewalmode = AUTORENEW | AUTOEXPIRE | AUTODELETE domain = (DOMAIN) period = 1Y | 1M
(required) code = (CODE) description = (DESCRIPTION)