Hi @kauanmocelin,
As far as I know, no-ip doesn’t allow to add TXT records (at least on the free account). You could use another DDNS provider like dynu.com (it allows adding TXT records on free accounts), then you could use acme.sh client (it supports updating dynu records via API) to issue the cert.
1.- Create a free account on dynu.com.
2.- Create a Dynamic DNS Service on dynu.com. Here you add your subdomain and choose the base domain (there are a few to choose, in this example I will use mydyndomain as subdomain and dynu.net as base domain)
3.- Once the domain is created, go to Control Panel -> API Credentials and click on button Reset Credentials, now take note of Client ID and Secret (we will use them later).
4.- Here you could install their dynamic client so it will update your dynamic address or use wget, etc. more info here https://www.dynu.com/DynamicDNS/IPUpdateClient
5.- Install acme.sh client (more info in https://acme.sh)
curl https://get.acme.sh | sh
6.- Once installed, issue the cert for your domain. Here we will export 2 variables containing the previously created Client ID and Secret (obvously you need to replace the content of these variables with the real data):
export Dynu_ClientId="xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
export Dynu_Secret="yyyyyyyyyyyyyyyyyyyyyyyyy"
acme.sh --issue --dns dns_dynu -d mydyndomain.dynu.net
And if all work as expected, you get your certificate.
Hope this helps.
Cheers,
sahsanu