$domain = 'your.domain.to.update'  # your domain
$name = 'name_of_host' #name of the A record to update
$key = 'key' #key for godaddy developer API
$secret = 'Secret' #Secret for godday developer API

$headers = @{}
$headers["Authorization"] = 'sso-key ' + $key + ':' + $secret
$result = Invoke-WebRequest https://api.godaddy.com/v1/domains/$domain/records/A/$name -method get -headers $headers
$content = ConvertFrom-Json $result.content
$dnsIp = $content.data

# Get public ip address there are several websites that can do this.
$currentIp = Invoke-RestMethod http://ipinfo.io/json | Select -exp ip

if ( $currentIp -ne $dnsIp) {
    $Request = @{ttl=3600;data=$currentIp }
    $JSON = Convertto-Json $request
    Invoke-WebRequest https://api.godaddy.com/v1/domains/$domain/records/A/$name -method put -headers $headers -Body $json -ContentType "application/json"
}

domain=""   # your domain
name=""     # name of A record to update
key=""      # key for godaddy developer API
secret=""   # secret for godaddy developer API

headers="Authorization: sso-key $key:$secret"

# echo $headers

result=$(curl -s -X GET -H "$headers" \
 "https://api.godaddy.com/v1/domains/$domain/records/A/$name")

dnsIp=$(echo $result | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")
# echo "dnsIp:" $dnsIp

# Get public ip address there are several websites that can do this.
ret=$(curl -s GET "http://ipinfo.io/json")
currentIp=$(echo $ret | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b")
# echo "currentIp:" $currentIp

 if [ $dnsIp != $currentIp ];
 then
#	echo "Ips are not equal"
	request='{"data":"'$currentIp'","ttl":3600}'
#	echo $request
	nresult=$(curl -i -s -X PUT \
 -H "$headers" \
 -H "Content-Type: application/json" \
 -d $request "https://api.godaddy.com/v1/domains/$domain/records/A/$name")
#	echo $nresult
fi

#GoDaddy DDNS Update Script
#Tested with RouterOS 6.45.2 (Minimum version RouterOS 6.44)
#Date:2020/10/12
#The script requires "read,write,policy,test" policies to work with global variables.

#Create Schedule running
# /system scheduler add name=update-ddns interval=10m on-event=godaddy-ddns

:local Domain "Domain"
:local Hostname "Hostname"
:local APIKey "GoDaddy Key"
:local APISecret "GoDaddy Secret"

# DDNS Params
:local ddnsURL "https://api.godaddy.com/v1/domains/$Domain/records/A/$Hostname"

# Get current IP
:global currentIP
:local IPGetURL "https://ipecho.net/plain"
:local result [/tool fetch url=$IPGetURL http-method=get as-value output=user]

:if ($result->"status" = "finished") do={
    :set currentIP ($result->"data")
} else={
    :log error ("DDNS: Error getting current IP from $IPGetURL")
    :err "Error getting current IP"
}

#Store global variable to check if update is required
:global lastConfiguredIP
:if ([:typeof [:global lastConfiguredIP]] = nil ) do={ :global lastConfiguredIP 0.0.0.0 } else={ :set lastConfiguredIP $lastConfiguredIP }

:if ($currentIP != $lastConfiguredIP) do={
    :log info "DDNS: Updating $Hostname.$Domain to use IP: $currentIP"
    :local ddnsipjson "[{\"type\":\"A\", \"name\":\"$Hostname\", \"data\":\"$currentIP\", \"ttl\":3600}]"
    :local result [/tool fetch url=$ddnsURL http-method=put http-data=$ddnsipjson http-header-field="content-type: application/json,Authorization: sso-key $APIKey:$APISecret" as-value output=user]
    :if ($result->"status" = "finished") do={
        :log info ("DDNS: Configured domain $Hostname.$Domain to IP $currentIP.")
        :global lastConfiguredIP $currentIP
    } else={
        :log error ("DDNS: Error setting domain $Hostname.$Domain to IP $currentIP. $result->status")
    }
} else={
    :log info "DDNS: Domain $Hostname.$Domain current IP $currentIP not changed. Not updated."
}