diff --git a/inwx-acme.md b/inwx-acme.md
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+This hook utilizes the xml-rpc api of http://inwx.com for handling dns-01 type challenges.
+Its only dependencies are bash, libxml2 and curl.
+
+The hook expects to find inwx credentials in `$BASEDIR/inwx-acme.auth`:
+
+```
+#!/usr/bin/bash
+# inwx-acme.auth
+
+user='your inwx username'
+pass='your inwx password'
+```
+
+``` bash
+#!/usr/bin/bash
+# inwx-acme
+
+# Copyright (c) Joakim Reinert. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+API_URL='https://api.domrobot.com/xmlrpc/'
+TMPDIR='/tmp/inwx-acme'
+
+source "$BASEDIR/inwx-acme.auth" # contains user and pass variables
+
+USER=$user
+PASS=$pass
+
+build_method_call() {
+	local method_name=$1
+	shift
+	echo -n "<?xml version=\"1.0\"?>"
+	echo -n "<methodCall>"
+	echo -n "<methodName>$method_name</methodName>"
+	echo -n "<params><param><value><struct>"
+
+	for param in "$@"; do
+		echo -n "$param"
+	done
+
+	echo -n "$(build_param "user" "$USER")"
+	echo -n "$(build_param "pass" "$PASS")"
+
+	echo -n "</struct></value></param></params>"
+	echo -n "</methodCall>"
+}
+
+build_param() {
+	local name=$1
+	local value=$2
+	local type=${3:-string}
+	echo -n '<member>'
+	echo -n "<name>$name</name>"
+	echo -n "<value><$type>"
+	if [[ "$type" = 'string' ]]; then
+		echo -n "<![CDATA[$value]]>"
+	else
+		echo -n "$value"
+	fi
+	echo -n "</$type></value>"
+	echo -n "</member>"
+}
+
+build_create_record_call() {
+	local domain=$1
+	local name=$2
+	local type=$3
+	local content=$4
+	local ttl=3600
+
+	build_method_call 'nameserver.createRecord' \
+		"$(build_param 'domain' $domain)" \
+		"$(build_param 'name' $name)" \
+		"$(build_param 'type' $type)" \
+		"$(build_param 'content' $content)" \
+		"$(build_param 'ttl' $ttl 'int')"
+}
+
+build_list_call() {
+	build_method_call 'nameserver.list'
+}
+
+build_delete_record_call() {
+	local id=$1
+	build_method_call 'nameserver.deleteRecord' \
+		"$(build_param 'id' $id)"
+}
+
+method_call() {
+	local call=$1
+	local result=$(curl -s -c "$TMPDIR/cookies" -d "$call" -H 'Content-Type: text/xml' "$API_URL")
+	local xpath='//methodResponse//params//member/name[text()="code"]/../value/int/text()'
+	local code=$(echo "$result" | xmllint --xpath "$xpath" -)
+	if [ $code = 1000 ]; then
+		echo "$result"
+		return 0
+	else
+		echo "$result" >&2
+		return 1
+	fi
+}
+
+deploy_challenge() {
+	local domain
+	local subdomain
+	if [[ -z "${1/*.*.*/}" ]]; then
+		domain=${1#*.}
+		subdomain=${1%%.*}
+	else
+		domain=$1
+		subdomain=''
+	fi
+	local token=$2
+
+	local result=$(method_call \
+		"$(build_create_record_call "$domain" "_acme-challenge.$subdomain" 'TXT' "$token")")
+	local code=$?
+	local xpath='//methodResponse//params//member/name[text()="id"]/../value/int/text()'
+	echo "$result" | xmllint --xpath "$xpath" -
+	return $code
+}
+
+clean_challenge() {
+	local record_id=$1
+	method_call \
+		"$(build_delete_record_call "$record_id")" > /dev/null
+}
+
+mkdir -p "$TMPDIR"
+
+case $1 in
+'deploy_challenge')
+	deploy_challenge "$2" "$4" > "$TMPDIR/$2.id"
+	;;
+'clean_challenge')
+	clean_challenge "$(cat "$TMPDIR/$2.id")" || exit 1
+	rm "$TMPDIR/$2.id"
+	;;
+esac
+```
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