diff --git a/dnsapi/dns_ispman.sh b/dnsapi/dns_ispman.sh
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+#!/usr/bin/env sh
+#!!!!!!!!!!!!!!!!!!!!!!! Important !!!!!!!!!!!!!!!!!!!!!!
+#! Make sure the verson of ISPMan supports TXT records  !
+#!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+######################## Forward ########################
+
+#This file name is "dns_ispman.sh"
+#So, here must be a method dns_ispman_add()
+#Which will be called by acme.sh to add the txt record to your api system.
+#returns 0 means success, otherwise error.
+
+#Authored by Adrian Fedoreanu (dns_1984hosting.sh)
+#Modified by Gary C. New (dns_ispman.sh)
+#Report Bugs here: https://github.com/acmesh-official/acme.sh
+# or here... https://github.com/acmesh-official/acme.sh/issues/????
+
+#################### Public Functions ####################
+
+# Export ISPMan Username and Password in following variables
+#
+# export ACME_USE_WGET=1
+# export ISPMan_Username=domain
+# export ISPMan_Password=passwd
+#
+# Domain Cookie is saved in $LE_WORKING_DIR/account.conf
+# Username/Password need to be set only when changed.
+
+# While ISPMan does not work with acme.sh curl implementation
+# Force acme.sh to use wget by exporting the following variable
+
+export ACME_USE_WGET=1
+
+#Usage: dns_ispman_add   _acme-challenge.www.domain.tld   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_ispman_add() {
+  fulldomain=$1
+  domainname="$(echo ${fulldomain#_acme-challenge.} | sed "s/\-/_HYPHEN_/g" | sed "s/\./_DOT_/g")"
+  txtvalue=$2
+
+  _info "Add TXT record using ISPMan"
+  _debug fulldomain "$fulldomain"
+  _debug domainname "$domainname"
+  _debug txtvalue "$txtvalue"
+
+  # fulldomain="_acme-challenge.example-domain.tld"; domain="${domain:-$(echo domain_${fulldomain#_acme-challenge.}_name)}"; echo "$domain"
+  ISPMan_Username="${ISPMan_Username:-$(_readaccountconf_mutable ISPMan_${domainname}_Username)}"
+  ISPMan_Password="${ISPMan_Password:-$(_readaccountconf_mutable ISPMan_${domainname}_Password)}"
+
+  _debug2 ISPMan_Username "$ISPMan_Username"
+  _debug2 "ISPMan_${domainname}_Username" "${ISPMan_Username:-$(_readaccountconf_mutable ISPMan_${domainname}_Username)}"
+
+  if ! _ispman_login; then
+    _err "ISPMan login failed for user $ISPMan_Username. Check $HTTP_HEADER file"
+    return 1
+  fi
+
+  _saveaccountconf_mutable ISPMan_${domainname}_Username "$ISPMan_Username"
+  _saveaccountconf_mutable ISPMan_${domainname}_Password "$ISPMan_Password"
+
+  chmod 600 "$LE_WORKING_DIR/account.conf"
+
+  _debug "First detect the root zone"
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain" "$fulldomain"
+    return 1
+  fi
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+
+  _debug "Add TXT record $fulldomain with value '$txtvalue'"
+  host="$(printf '%s' "$fulldomain" | _url_encode)"
+  text="$(printf '%s' "$txtvalue" | _url_encode)"
+  url="http://192.168.0.49/secure/ispman/control_panel/index.cgi"
+  url="$url?mode=addDNSRecord&type=txt&host=$host&text=$text"
+  _debug2 url "$url"
+
+  #_authpost "$postdata" "$url"
+  _authget "$url"
+  response="$(echo "$_response" | _normalizeJson)"
+  _debug2 response "$response"
+
+  if _contains "$response" "Unauthorized"; then
+    _err "ISPMan failed to add TXT record for $_sub_domain. Invalid or expired cookie"
+    return 1
+  fi
+
+  _info "Added acme challenge TXT record for $fulldomain at ISPMan"
+  return 0
+}
+
+#Usage: fulldomain txtvalue
+#Remove the txt record after validation.
+dns_ispman_rm() {
+  fulldomain=$1
+  domainname="$(echo ${fulldomain#_acme-challenge.} | sed "s/\-/_HYPHEN_/g" | sed "s/\./_DOT_/g")"
+  txtvalue=$2
+
+  _info "Delete TXT record using ISPMan"
+  _debug fulldomain "$fulldomain"
+  _debug domainname "$domainname"
+  _debug txtvalue "$txtvalue"
+
+  # fulldomain="_acme-challenge.example-domain.tld"; domain="${domain:-$(echo domain_${fulldomain#_acme-challenge.}_name)}"; echo "$domain"
+  ISPMan_Username="${ISPMan_Username:-$(_readaccountconf_mutable ISPMan_${domainname}_Username)}"
+  ISPMan_Password="${ISPMan_Password:-$(_readaccountconf_mutable ISPMan_${domainname}_Password)}"
+
+  _debug2 ISPMan_Username "$ISPMan_Username"
+  _debug2 "ISPMan_${domainname}_Username" "${ISPMan_Username:-$(_readaccountconf_mutable ISPMan_${domainname}_Username)}"
+
+  if ! _ispman_login; then
+    _err "ISPMan login failed for user $ISPMan_Username. Check $HTTP_HEADER file"
+    return 1
+  fi
+
+  _saveaccountconf_mutable ISPMan_${domainname}_Username "$ISPMan_Username"
+  _saveaccountconf_mutable ISPMan_${domainname}_Password "$ISPMan_Password"
+
+  chmod 600 "$LE_WORKING_DIR/account.conf"
+
+  _debug "First detect the root zone"
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain" "$fulldomain"
+    return 1
+  fi
+  _debug _sub_domain "$_sub_domain"
+  _debug _domain "$_domain"
+  _debug "Delete $fulldomain TXT record"
+
+  host="$(printf '%s' "$fulldomain" | _url_encode)"                             
+  text="$(printf '%s' "$txtvalue" | _url_encode)"                               
+  url="http://192.168.0.49/secure/ispman/control_panel/index.cgi"               
+  url="$url?mode=deleteDNSRecord&type=txt&host=$host&text=$text"
+  _debug2 url "$url"
+
+  _authget "$url"
+  response="$(echo "$_response" | _normalizeJson)"
+  _debug2 response "$response"
+
+  if _contains "$response" "Unauthorized"; then
+    _err "ISPMan failed to delete TXT record for $_sub_domain. Invalid or expired cookie"
+    return 1
+  fi
+
+  _info "Deleted acme challenge TXT record for $fulldomain at ISPMan"
+  return 0
+}
+
+#################### Private Functions ####################
+
+# usage: _ispman_login username password
+# returns 0 success
+_ispman_login() {
+  if ! _check_credentials; then return 1; fi
+
+  if _check_cookies; then
+    _debug "Already logged in"
+    return 0
+  fi
+
+  _debug "Login to ISPMan as user $ISPMan_Username"
+  username=$(printf '%s' "$ISPMan_Username" | _url_encode)
+  password=$(printf '%s' "$ISPMan_Password" | _url_encode)
+  url="http://192.168.0.49/secure/ispman/control_panel/index.cgi?mode=index"
+
+  # _post(body  url [needbase64] [POST|PUT|DELETE] [ContentType])
+  #response="$(_post "domain=$username&pass=$password" $url "" "POST" "application/x-www-form-urlencoded")"
+  response="$(_post "domain=$username&pass=$password" $url)"
+  response="$(echo "$response" | _normalizeJson)"
+  _debug2 response "$response"
+
+  if _contains "$response" "$username"; then
+    # Set-Cookie: domain=domain.tld; path=/; expires=1h
+    ISPMan_COOKIE="$(grep -i '^set-cookie:' "$HTTP_HEADER" | _egrep_o 'domain=[^;]*;' | tr -d ';')"
+    export ISPMan_COOKIE
+    _saveaccountconf_mutable ISPMan_${domainname}_COOKIE "$ISPMan_COOKIE"
+    return 0
+  fi
+  return 1
+}
+
+_check_credentials() {
+  if [ -z "$ISPMan_Username" ] || [ -z "$ISPMan_Password" ]; then
+    ISPMan_Username=""
+    ISPMan_Password=""
+    _err "You haven't specified ISPMan Username or Password yet."
+    _err "Please export as ISPMan_Username / ISPMan_Password and try again."
+    return 1
+  fi
+  return 0
+}
+
+_check_cookies() {
+  ISPMan_COOKIE="${ISPMan_COOKIE:-$(_readaccountconf_mutable ISPMan_${domainname}_COOKIE)}"
+  if [ -z "$ISPMan_COOKIE" ]; then
+    _debug "No cached cookie(s) found"
+    return 1
+  fi
+
+  _authget "http://192.168.0.49/secure/ispman/control_panel/index.cgi"
+  if _contains "$response" "$username"; then
+    _debug "Cached cookies still valid"
+    return 0
+  fi
+
+  _debug "Cached cookies no longer valid"
+  ISPMan_COOKIE=""
+  _saveaccountconf_mutable ISPMan_${domainname}_COOKIE "$ISPMan_COOKIE"
+  return 1
+}
+
+#_acme-challenge.www.domain.tld
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.tld
+_get_root() {
+  domain="$1"
+  i=1
+  p=1
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+    _debug2 h "$h"
+
+    if [ -z "$h" ]; then
+      #not valid
+      return 1
+    fi
+
+    # The ISPMan Customer Control Panel doesn't allow access to the SOA Record
+    # The ISPMan_Username is the Domain Root for the Customer Control Panel
+    if _startswith "$h" "$ISPMan_Username"; then
+      _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+      _domain="$h"
+      return 0
+    fi
+    p=$i
+    i=$(_math "$i" + 1)
+  done
+  return 1
+}
+
+# add extra headers to request
+_authget() {
+  export _H1="Cookie: $ISPMan_COOKIE"
+  _response=$(_get "$1" | _normalizeJson)
+  _debug2 _response "$_response"
+}
+
+# truncate huge HTML response
+# echo: Argument list too long
+_htmlget() {
+  export _H1="Cookie: $ISPMan_COOKIE"
+  _response=$(_get "$1" | grep "$2")
+  if _contains "$_response" "@$2"; then
+    _response=$(echo "$_response" | grep -v "[@]" | _head_n 1)
+  fi
+}
+
+# add extra headers to request
+_authpost() {
+  export _H1="Cookie: $ISPMan_COOKIE"
+  _response=$(_post "$1" $2 | _normalizeJson)
+  _debug2 _response "$_response"
+}