Yes, I can read and I also compared thous id, and its compeleatly the same as in first response. It worked time ago, and i don`t think that domain id is not unique and floating id witch updates in one domain/sub-domain lifecycle

there is my bash code:

#!/bin/bash
# Ubuntu package "jq" should be inststalled on machine

ip=$(curl -ss ipinfo.io/ip)
echo "Machine IP: $ip"

token="XXXXXXX" // tocen form my account
domain="XXXXXXX" // domain name (not sub)
record="XXXXXX" // sub-domain id

cdd=$(curl -ss GET -H "Content-Type: application/json" -H "Authorization: Bearer $token" "https://api.digitalocean.com/v2/domains/$domain/records/$record")
echo "Domain config: $cdd"

doDomainIp=$(echo $cdd | jq '.domain_record.data' | tr -d '"')

if [ "$ip" != "$doDomainIp" ]; then
    echo "Update domain DNS required!"
    echo "Domain Old Ip: $doDomainIp"
    echo "New Ip: $ip"

call=$(curl -ss PUT -H "Content-Type: application/json" -H "Authorization: Bearer $token" -d '{"data":"'$ip'"}' "https://api.digitalocean.com/v2/domains/$domain/records/$record")

    echo "Response of Domain DNS update: $call"

else
    echo "Domain is setted up!"
    echo "Machine ip: $ip"
    echo "Domain ip: $doDomainIp"
fi