Dynamic DNS updating bash script via Cloudflare API

cloudflare-update-ip.sh

#!/bin/bash

zoneidentity="put here"
dnsidentity="put here"
authtoken="put here"
domain="put here"

myip="$(dig +short myip.opendns.com @resolver1.opendns.com)"

echo "Detected WAN IP address: ${myip}"

if [ -f ".ipaddress" ]; then
    compare=$(cat .ipaddress)
else
    compare="unknown"
fi

echo "Last updated WAN IP address: ${compare}"

if [[ "$compare" != "$myip" ]]; then
    response=$(curl \
         --write-out %{http_code} --silent --output /dev/null \
         -X PUT "https://api.cloudflare.com/client/v4/zones/${zoneidentity}/dns_records/${dnsidentity}" \
         -H "Authorization: Bearer ${authtoken}" \
         -H "Content-Type: application/json" \
         --data "{\"type\":\"A\",\"name\":\"${domain}\",\"content\":\"${myip}\",\"ttl\":120,\"proxied\":false}")

    if [[ "$response" == "200" ]]; then
        echo "$myip" > .ipaddress
        echo "Update success"
    else
        echo "Update error: ${response}"
    fi
else
    echo "IP already updated"
fi

crontab.txt

# run script every minute
* * * * * /root/cloudflare-update-ip.sh