Automatic Dynamics DNS updater using HTTP API calls, prepared for TwoDNS.de / Two-DNS.de (works with any other DDNS Service, allowing IP updates via HTTP API calls)

ddns_updater.sh

#!/bin/sh
log="ddns_updater.log.txt"
my_ext_ip=$(curl -sS http://ipv4.icanhazip.com)
echo "\n\n\n===== \
   \n$(date -u) \
   \nUpdating IP to: $my_ext_ip \n" >> $log
curl -isSX PUT \
   -u "[email protected]:YOUR_API_TOKEN" \
   -H "Content-Type: application/json" \
   --data '{"ip_address":"'$my_ext_ip'", "activate_wildcard": "false"}' \
   https://api.twodns.de/hosts/YOUR_HOSTNAME.dynvpn.de >> $log
exit

updated URL for icanhazip and made field that must be customized more clear