diff --git a/dnsapi/dns_ispconfig.sh b/dnsapi/dns_ispconfig.sh
index eb55d356..315dd6ef 100755
--- a/dnsapi/dns_ispconfig.sh
+++ b/dnsapi/dns_ispconfig.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/env sh
+#!/usr/bin/env bash
 
 # ISPConfig 3.1 API
 # User must provide login data and URL to the ISPConfig installation incl. port. The remote user in ISPConfig must have access to:
@@ -9,7 +9,7 @@
 
 # Values to export:
 # export ISPC_User="remoteUser"
-# export ISPC_Password="remotePasword"
+# export ISPC_Password="remotePassword"
 # export ISPC_Api="https://ispc.domain.tld:8080/remote/json.php"
 # export ISPC_Api_Insecure=1     # Set 1 for insecure and 0 for secure -> difference is whether ssl cert is checked for validity (0) or whether it is just accepted (1)
 
@@ -19,12 +19,14 @@
 dns_ispconfig_add() {
   fulldomain="${1}"
   txtvalue="${2}"
+  _debug "Calling: dns_ispconfig_add() '${fulldomain}' '${txtvalue}'"
   _ISPC_credentials && _ISPC_login && _ISPC_getZoneInfo && _ISPC_addTxt
 }
 
 #Usage: dns_myapi_rm   _acme-challenge.www.domain.com
 dns_ispconfig_rm() {
   fulldomain="${1}"
+  _debug "Calling: dns_ispconfig_rm() '${fulldomain}'"
   _ISPC_credentials && _ISPC_login && _ISPC_rmTxt
 }
 
@@ -52,9 +54,12 @@ _ISPC_login() {
   _info "Getting Session ID"
   curData="{\"username\":\"${ISPC_User}\",\"password\":\"${ISPC_Password}\",\"client_login\":false}"
   curResult="$(_post "${curData}" "${ISPC_Api}?login")"
+  _debug "Calling _ISPC_login: '${curData}' '${ISPC_Api}?login'"
+  _debug "Result of _ISPC_login: '$curResult'"
   if _contains "${curResult}" '"code":"ok"'; then
     sessionID=$(echo "${curResult}" | _egrep_o "response.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
     _info "Retrieved Session ID."
+    _debug "Session ID: '${sessionID}'"
   else
     _err "Couldn't retrieve the Session ID."
     return 1
@@ -69,12 +74,15 @@ _ISPC_getZoneInfo() {
     # we can strip the first part of the fulldomain, since it's just the _acme-challenge string
     curZone="${curZone#*.}"
     # suffix . needed for zone -> domain.tld.
-    curData="{\"session_id\":\"${sessionID}\",\"primary_id\":[{\"origin\":\"${curZone}.\"}]}"
+    curData="{\"session_id\":\"${sessionID}\",\"primary_id\":{\"origin\":\"${curZone}.\"}}"
     curResult="$(_post "${curData}" "${ISPC_Api}?dns_zone_get")"
+    _debug "Calling _ISPC_getZoneInfo: '${curData}' '${ISPC_Api}?login'"
+    _debug "Result of _ISPC_getZoneInfo: '$curResult'"
     if _contains "${curResult}" '"id":"'; then
       zoneFound=true
       zoneEnd=true
       _info "Retrieved zone data."
+      _debug "Zone data: '${curResult}'"
     fi
     if [ "${curZone#*.}" != "$curZone" ]; then
       _debug2 "$curZone still contains a '.' - so we can check next higher level"
@@ -86,6 +94,7 @@ _ISPC_getZoneInfo() {
   done
   if [ "${zoneFound}" ]; then
     server_id=$(echo "${curResult}" | _egrep_o "server_id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    _debug "Server ID: '${server_id}'"
     case "${server_id}" in
       '' | *[!0-9]*)
         _err "Server ID is not numeric."
@@ -94,6 +103,7 @@ _ISPC_getZoneInfo() {
       *) _info "Retrieved Server ID" ;;
     esac
     zone=$(echo "${curResult}" | _egrep_o "\"id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    _debug "Zone: '${zone}'"
     case "${zone}" in
       '' | *[!0-9]*)
         _err "Zone ID is not numeric."
@@ -102,6 +112,7 @@ _ISPC_getZoneInfo() {
       *) _info "Retrieved Zone ID" ;;
     esac
     client_id=$(echo "${curResult}" | _egrep_o "sys_userid.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    _debug "Client ID: '${client_id}'"
     case "${client_id}" in
       '' | *[!0-9]*)
         _err "Client ID is not numeric."
@@ -120,7 +131,10 @@ _ISPC_addTxt() {
   params="\"server_id\":\"${server_id}\",\"zone\":\"${zone}\",\"name\":\"${fulldomain}.\",\"type\":\"txt\",\"data\":\"${txtvalue}\",\"aux\":\"0\",\"ttl\":\"3600\",\"active\":\"y\",\"stamp\":\"${curStamp}\",\"serial\":\"${curSerial}\""
   curData="{\"session_id\":\"${sessionID}\",\"client_id\":\"${client_id}\",\"params\":{${params}}}"
   curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_add")"
+  _debug "Calling _ISPC_addTxt: '${curData}' '${ISPC_Api}?dns_txt_add'"
+  _debug "Result of _ISPC_addTxt: '$curResult'"
   record_id=$(echo "${curResult}" | _egrep_o "\"response.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+  _debug "Record ID: '${record_id}'"
   case "${record_id}" in
     '' | *[!0-9]*)
       _err "Couldn't add ACME Challenge TXT record to zone."
@@ -134,8 +148,11 @@ _ISPC_rmTxt() {
   # Need to get the record ID.
   curData="{\"session_id\":\"${sessionID}\",\"primary_id\":{\"name\":\"${fulldomain}.\",\"type\":\"TXT\"}}"
   curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_get")"
+  _debug "Calling _ISPC_rmTxt: '${curData}' '${ISPC_Api}?dns_txt_get'"
+  _debug "Result of _ISPC_rmTxt: '$curResult'"
   if _contains "${curResult}" '"code":"ok"'; then
     record_id=$(echo "${curResult}" | _egrep_o "\"id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    _debug "Record ID: '${record_id}'"
     case "${record_id}" in
       '' | *[!0-9]*)
         _err "Record ID is not numeric."
@@ -146,6 +163,8 @@ _ISPC_rmTxt() {
         _info "Retrieved Record ID."
         curData="{\"session_id\":\"${sessionID}\",\"primary_id\":\"${record_id}\"}"
         curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_delete")"
+        _debug "Calling _ISPC_rmTxt: '${curData}' '${ISPC_Api}?dns_txt_delete'"
+        _debug "Result of _ISPC_rmTxt: '$curResult'"
         if _contains "${curResult}" '"code":"ok"'; then
           _info "Removed ACME Challenge TXT record from zone."
         else