The way to update DDNS is to send 'mykey' as 'yourCode' and 'ddnsdomain' as 'yourDomain' as POST data to the URL below.
Additionally, you can set the 'hostname' by sending it as POST data. If not sent, '@' will be automatically added.
Once successful, check with excitement as it gets added to the zone!
For DDNS updates, you can't refresh within a minute for the same domain.
Passing the check doesn't guarantee smooth operation—it's just a quick assessment.
No need for double quotes at both ends during TXT.