diff --git a/acme.sh b/acme.sh
index 472975a6..604bff04 100755
--- a/acme.sh
+++ b/acme.sh
@@ -13,8 +13,15 @@ _SCRIPT_="$0"
 
 _SUB_FOLDERS="dnsapi deploy"
 
-_OLD_CA_HOST="https://acme-v01.api.letsencrypt.org"
-DEFAULT_CA="https://acme-v01.api.letsencrypt.org/directory"
+LETSENCRYPT_CA_V1="https://acme-v01.api.letsencrypt.org/directory"
+LETSENCRYPT_STAGING_CA_V1="https://acme-staging.api.letsencrypt.org/directory"
+
+LETSENCRYPT_CA_V2="https://acme-v02.api.letsencrypt.org/directory"
+LETSENCRYPT_STAGING_CA_V2="https://acme-staging-v02.api.letsencrypt.org/directory"
+
+DEFAULT_CA=$LETSENCRYPT_CA_V1
+DEFAULT_STAGING_CA=$LETSENCRYPT_STAGING_CA_V1
+
 
 DEFAULT_USER_AGENT="$PROJECT_NAME/$VER ($PROJECT)"
 DEFAULT_ACCOUNT_EMAIL=""
@@ -24,13 +31,13 @@ DEFAULT_DOMAIN_KEY_LENGTH=2048
 
 DEFAULT_OPENSSL_BIN="openssl"
 
-STAGE_CA="https://acme-staging.api.letsencrypt.org/directory"
+_OLD_CA_HOST="https://acme-v01.api.letsencrypt.org"
 _OLD_STAGE_CA_HOST="https://acme-staging.api.letsencrypt.org"
 
 VTYPE_HTTP="http-01"
 VTYPE_DNS="dns-01"
 VTYPE_TLS="tls-sni-01"
-#VTYPE_TLS2="tls-sni-02"
+VTYPE_TLS2="tls-sni-02"
 
 LOCAL_ANY_ADDRESS="0.0.0.0"
 
@@ -1044,13 +1051,14 @@ _createcsr() {
   if [ -z "$domainlist" ] || [ "$domainlist" = "$NO_VALUE" ]; then
     #single domain
     _info "Single domain" "$domain"
+    printf -- "\nsubjectAltName=DNS:$domain" >>"$csrconf"
   else
     domainlist="$(_idn "$domainlist")"
     _debug2 domainlist "$domainlist"
     if _contains "$domainlist" ","; then
-      alt="DNS:$(echo "$domainlist" | sed "s/,/,DNS:/g")"
+      alt="DNS:$domain,DNS:$(echo "$domainlist" | sed "s/,/,DNS:/g")"
     else
-      alt="DNS:$domainlist"
+      alt="DNS:$domain,DNS:$domainlist"
     fi
     #multi
     _info "Multi domain" "$alt"
@@ -1421,7 +1429,7 @@ _calcjwk() {
 
     JWK_HEADER='{"alg": "RS256", "jwk": '$jwk'}'
     JWK_HEADERPLACE_PART1='{"nonce": "'
-    JWK_HEADERPLACE_PART2='", "alg": "RS256", "jwk": '$jwk'}'
+    JWK_HEADERPLACE_PART2='", "alg": "RS256"'
   elif grep "BEGIN EC PRIVATE KEY" "$keyfile" >/dev/null 2>&1; then
     _debug "EC key"
     crv="$(${ACME_OPENSSL_BIN:-openssl} ec -in "$keyfile" -noout -text 2>/dev/null | grep "^NIST CURVE:" | cut -d ":" -f 2 | tr -d " \r\n")"
@@ -1490,7 +1498,7 @@ _calcjwk() {
 
     JWK_HEADER='{"alg": "ES'$__ECC_KEY_LEN'", "jwk": '$jwk'}'
     JWK_HEADERPLACE_PART1='{"nonce": "'
-    JWK_HEADERPLACE_PART2='", "alg": "ES'$__ECC_KEY_LEN'", "jwk": '$jwk'}'
+    JWK_HEADERPLACE_PART2='", "alg": "ES'$__ECC_KEY_LEN'"'
   else
     _err "Only RSA or EC key is supported."
     return 1
@@ -1580,7 +1588,7 @@ _inithttp() {
 # body  url [needbase64] [POST|PUT]
 _post() {
   body="$1"
-  url="$2"
+  _post_url="$2"
   needbase64="$3"
   httpmethod="$4"
 
@@ -1588,7 +1596,7 @@ _post() {
     httpmethod="POST"
   fi
   _debug $httpmethod
-  _debug "url" "$url"
+  _debug "_post_url" "$_post_url"
   _debug2 "body" "$body"
 
   _inithttp
@@ -1600,9 +1608,9 @@ _post() {
     fi
     _debug "_CURL" "$_CURL"
     if [ "$needbase64" ]; then
-      response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$url" | _base64)"
+      response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url" | _base64)"
     else
-      response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$url")"
+      response="$($_CURL --user-agent "$USER_AGENT" -X $httpmethod -H "$_H1" -H "$_H2" -H "$_H3" -H "$_H4" -H "$_H5" --data "$body" "$_post_url")"
     fi
     _ret="$?"
     if [ "$_ret" != "0" ]; then
@@ -1620,15 +1628,15 @@ _post() {
     _debug "_WGET" "$_WGET"
     if [ "$needbase64" ]; then
       if [ "$httpmethod" = "POST" ]; then
-        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --post-data="$body" "$url" 2>"$HTTP_HEADER" | _base64)"
+        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --post-data="$body" "$_post_url" 2>"$HTTP_HEADER" | _base64)"
       else
-        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --method $httpmethod --body-data="$body" "$url" 2>"$HTTP_HEADER" | _base64)"
+        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --method $httpmethod --body-data="$body" "$_post_url" 2>"$HTTP_HEADER" | _base64)"
       fi
     else
       if [ "$httpmethod" = "POST" ]; then
-        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --post-data="$body" "$url" 2>"$HTTP_HEADER")"
+        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --post-data="$body" "$_post_url" 2>"$HTTP_HEADER")"
       else
-        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --method $httpmethod --body-data="$body" "$url" 2>"$HTTP_HEADER")"
+        response="$($_WGET -S -O - --user-agent="$USER_AGENT" --header "$_H5" --header "$_H4" --header "$_H3" --header "$_H2" --header "$_H1" --method $httpmethod --body-data="$body" "$_post_url" 2>"$HTTP_HEADER")"
       fi
     fi
     _ret="$?"
@@ -1776,7 +1784,15 @@ _send_signed_request() {
     nonce="$_CACHED_NONCE"
     _debug2 nonce "$nonce"
 
-    protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2"
+    if [ "$ACME_VERSION" = "2" ]; then
+      if [ "$url" = "$ACME_NEW_ACCOUNT" ]; then
+        protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"jwk\": $jwk"'}'
+      else
+        protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"kid\": \"$ACCOUNT_URL\""'}'
+      fi
+    else
+      protected="$JWK_HEADERPLACE_PART1$nonce\", \"url\": \"${url}$JWK_HEADERPLACE_PART2, \"jwk\": $jwk"'}'
+    fi
     _debug3 protected "$protected"
 
     protected64="$(printf "%s" "$protected" | _base64 | _url_replace)"
@@ -1791,7 +1807,11 @@ _send_signed_request() {
     sig="$(printf "%s" "$_sig_t" | _url_replace)"
     _debug3 sig "$sig"
 
-    body="{\"header\": $JWK_HEADER, \"protected\": \"$protected64\", \"payload\": \"$payload64\", \"signature\": \"$sig\"}"
+    if [ "$ACME_VERSION" = "2" ]; then
+      body="{\"protected\": \"$protected64\", \"payload\": \"$payload64\", \"signature\": \"$sig\"}"
+    else
+      body="{\"header\": $JWK_HEADER, \"protected\": \"$protected64\", \"payload\": \"$payload64\", \"signature\": \"$sig\"}"
+    fi
     _debug3 body "$body"
 
     response="$(_post "$body" "$url" "$needbase64")"
@@ -2170,9 +2190,15 @@ _initAPI() {
     _debug2 "response" "$response"
 
     ACME_KEY_CHANGE=$(echo "$response" | _egrep_o 'key-change" *: *"[^"]*"' | cut -d '"' -f 3)
+    if [ -z "$ACME_KEY_CHANGE" ]; then
+      ACME_KEY_CHANGE=$(echo "$response" | _egrep_o 'keyChange" *: *"[^"]*"' | cut -d '"' -f 3)
+    fi
     export ACME_KEY_CHANGE
 
     ACME_NEW_AUTHZ=$(echo "$response" | _egrep_o 'new-authz" *: *"[^"]*"' | cut -d '"' -f 3)
+    if [ -z "$ACME_NEW_AUTHZ" ]; then
+      ACME_NEW_AUTHZ=$(echo "$response" | _egrep_o 'newAuthz" *: *"[^"]*"' | cut -d '"' -f 3)
+    fi
     export ACME_NEW_AUTHZ
 
     ACME_NEW_ORDER=$(echo "$response" | _egrep_o 'new-cert" *: *"[^"]*"' | cut -d '"' -f 3)
@@ -2180,6 +2206,9 @@ _initAPI() {
     if [ -z "$ACME_NEW_ORDER" ]; then
       ACME_NEW_ORDER=$(echo "$response" | _egrep_o 'new-order" *: *"[^"]*"' | cut -d '"' -f 3)
       ACME_NEW_ORDER_RES="new-order"
+      if [ -z "$ACME_NEW_ORDER" ]; then
+        ACME_NEW_ORDER=$(echo "$response" | _egrep_o 'newOrder" *: *"[^"]*"' | cut -d '"' -f 3)
+      fi
     fi
     export ACME_NEW_ORDER
     export ACME_NEW_ORDER_RES
@@ -2189,17 +2218,32 @@ _initAPI() {
     if [ -z "$ACME_NEW_ACCOUNT" ]; then
       ACME_NEW_ACCOUNT=$(echo "$response" | _egrep_o 'new-account" *: *"[^"]*"' | cut -d '"' -f 3)
       ACME_NEW_ACCOUNT_RES="new-account"
+      if [ -z "$ACME_NEW_ACCOUNT" ]; then
+        ACME_NEW_ACCOUNT=$(echo "$response" | _egrep_o 'newAccount" *: *"[^"]*"' | cut -d '"' -f 3)
+        if [ "$ACME_NEW_ACCOUNT" ]; then
+          export ACME_VERSION=2
+        fi
+      fi
     fi
     export ACME_NEW_ACCOUNT
     export ACME_NEW_ACCOUNT_RES
 
     ACME_REVOKE_CERT=$(echo "$response" | _egrep_o 'revoke-cert" *: *"[^"]*"' | cut -d '"' -f 3)
+    if [ -z "$ACME_REVOKE_CERT" ]; then
+      ACME_REVOKE_CERT=$(echo "$response" | _egrep_o 'revokeCert" *: *"[^"]*"' | cut -d '"' -f 3)
+    fi
     export ACME_REVOKE_CERT
 
     ACME_NEW_NONCE=$(echo "$response" | _egrep_o 'new-nonce" *: *"[^"]*"' | cut -d '"' -f 3)
+    if [ -z "$ACME_NEW_NONCE" ]; then
+      ACME_NEW_NONCE=$(echo "$response" | _egrep_o 'newNonce" *: *"[^"]*"' | cut -d '"' -f 3)
+    fi
     export ACME_NEW_NONCE
 
     ACME_AGREEMENT=$(echo "$response" | _egrep_o 'terms-of-service" *: *"[^"]*"' | cut -d '"' -f 3)
+    if [ -z "$ACME_AGREEMENT" ]; then
+      ACME_AGREEMENT=$(echo "$response" | _egrep_o 'termsOfService" *: *"[^"]*"' | cut -d '"' -f 3)
+    fi
     export ACME_AGREEMENT
 
     _debug "ACME_KEY_CHANGE" "$ACME_KEY_CHANGE"
@@ -2208,6 +2252,8 @@ _initAPI() {
     _debug "ACME_NEW_ACCOUNT" "$ACME_NEW_ACCOUNT"
     _debug "ACME_REVOKE_CERT" "$ACME_REVOKE_CERT"
     _debug "ACME_AGREEMENT" "$ACME_AGREEMENT"
+    _debug "ACME_NEW_NONCE" "$ACME_NEW_NONCE"
+    _debug "ACME_VERSION" "$ACME_VERSION"
 
   fi
 }
@@ -2236,7 +2282,7 @@ _initpath() {
     if [ -z "$STAGE" ]; then
       ACME_DIRECTORY="$DEFAULT_CA"
     else
-      ACME_DIRECTORY="$STAGE_CA"
+      ACME_DIRECTORY="$DEFAULT_STAGING_CA"
       _info "Using stage ACME_DIRECTORY: $ACME_DIRECTORY"
     fi
   fi
@@ -2951,6 +2997,7 @@ _on_issue_err() {
   _chk_post_hook="$1"
   _chk_vlist="$2"
   _debug _on_issue_err
+  _cleardomainconf "ORDER_FINALIZE"
   if [ "$LOG_FILE" ]; then
     _err "Please check log file for more details: $LOG_FILE"
   else
@@ -3052,6 +3099,8 @@ _regAccount() {
   _initpath
   _reg_length="$1"
   _debug3 _regAccount "$_regAccount"
+  _initAPI
+
   mkdir -p "$CA_DIR"
   if [ ! -f "$ACCOUNT_KEY_PATH" ] && [ -f "$_OLD_ACCOUNT_KEY" ]; then
     _info "mv $_OLD_ACCOUNT_KEY to $ACCOUNT_KEY_PATH"
@@ -3073,11 +3122,18 @@ _regAccount() {
   if ! _calcjwk "$ACCOUNT_KEY_PATH"; then
     return 1
   fi
-  _initAPI
-  _reg_res="$ACME_NEW_ACCOUNT_RES"
-  regjson='{"resource": "'$_reg_res'", "terms-of-service-agreed": true, "agreement": "'$ACME_AGREEMENT'"}'
-  if [ "$ACCOUNT_EMAIL" ]; then
-    regjson='{"resource": "'$_reg_res'", "contact": ["mailto: '$ACCOUNT_EMAIL'"], "terms-of-service-agreed": true, "agreement": "'$ACME_AGREEMENT'"}'
+  
+  if [ "$ACME_VERSION" = "2" ]; then
+    regjson='{"termsOfServiceAgreed": true}'
+    if [ "$ACCOUNT_EMAIL" ]; then
+      regjson='{"contact": ["mailto: '$ACCOUNT_EMAIL'"], "termsOfServiceAgreed": true}'
+    fi
+  else
+    _reg_res="$ACME_NEW_ACCOUNT_RES"
+    regjson='{"resource": "'$_reg_res'", "terms-of-service-agreed": true, "agreement": "'$ACME_AGREEMENT'"}'
+    if [ "$ACCOUNT_EMAIL" ]; then
+      regjson='{"resource": "'$_reg_res'", "contact": ["mailto: '$ACCOUNT_EMAIL'"], "terms-of-service-agreed": true, "agreement": "'$ACME_AGREEMENT'"}'
+    fi
   fi
 
   _info "Registering account"
@@ -3100,8 +3156,8 @@ _regAccount() {
   _accUri="$(echo "$responseHeaders" | grep "^Location:" | _head_n 1 | cut -d ' ' -f 2 | tr -d "\r\n")"
   _debug "_accUri" "$_accUri"
   _savecaconf "ACCOUNT_URL" "$_accUri"
+  export ACCOUNT_URL="$ACCOUNT_URL"
 
-  echo "$response" >"$ACCOUNT_JSON_PATH"
   CA_KEY_HASH="$(__calcAccountKeyHash)"
   _debug "Calc CA_KEY_HASH" "$CA_KEY_HASH"
   _savecaconf CA_KEY_HASH "$CA_KEY_HASH"
@@ -3113,7 +3169,6 @@ _regAccount() {
 
   ACCOUNT_THUMBPRINT="$(__calc_account_thumbprint)"
   _info "ACCOUNT_THUMBPRINT" "$ACCOUNT_THUMBPRINT"
-
 }
 
 #Implement deactivate account
@@ -3251,7 +3306,11 @@ __trigger_validation() {
   _debug2 _t_url "$_t_url"
   _t_key_authz="$2"
   _debug2 _t_key_authz "$_t_key_authz"
-  _send_signed_request "$_t_url" "{\"resource\": \"challenge\", \"keyAuthorization\": \"$_t_key_authz\"}"
+  if [ "$ACME_VERSION" = "2" ]; then
+    _send_signed_request "$_t_url" "{\"keyAuthorization\": \"$_t_key_authz\"}"
+  else
+    _send_signed_request "$_t_url" "{\"resource\": \"challenge\", \"keyAuthorization\": \"$_t_key_authz\"}"
+  fi
 }
 
 #webroot, domain domainlist  keylength
@@ -3393,32 +3452,107 @@ issue() {
   sep='#'
   dvsep=','
   if [ -z "$vlist" ]; then
+    if [ "$ACME_VERSION" = "2" ] && [ -z "$ORDER_FINALIZE" ]; then
+      #make new order request
+      _identifiers="{\"type\":\"dns\",\"value\":\"$_main_domain\"}"
+      for d in $(echo "$_alt_domains" | tr ',' ' '); do
+        #todo: check wildcard ?
+        if [ "$d" ]; then
+          _identifiers="$_identifiers,{\"type\":\"dns\",\"value\":\"$d\"}"
+        fi
+      done
+      _debug2 _identifiers "$_identifiers"
+      if ! _send_signed_request "$ACME_NEW_ORDER" "{\"identifiers\": [$_identifiers]}"; then
+        _err "Create new order error."
+        _clearup
+        _on_issue_err "$_post_hook"
+        return 1
+      fi
+
+      ORDER_FINALIZE="$(echo "$response"| tr -d '\r\n' | _egrep_o '"finalize" *: *"[^"]*"' | cut -d '"' -f 4)"
+      _debug ORDER_FINALIZE "$ORDER_FINALIZE"
+      if [ -z "$ORDER_FINALIZE" ]; then
+        _err "ORDER_FINALIZE not found."
+        _clearup
+        _on_issue_err "$_post_hook"
+        return 1
+      fi
+
+      #for dns manual mode
+      _savedomainconf "ORDER_FINALIZE" "$ORDER_FINALIZE"
+
+      _authorizations_seg="$(echo "$response"| tr -d '\r\n' | _egrep_o '"authorizations" *: *\[[^\]*\]' | cut -d '[' -f 2 | tr -d ']' | tr -d '"')"
+      _debug2 _authorizations_seg "$_authorizations_seg"
+      if [ -z "$_authorizations_seg" ]; then
+        _err "_authorizations_seg not found."
+        _clearup
+        _on_issue_err "$_post_hook"
+        return 1
+      fi
+
+      #domain and authz map
+      _authorizations_map=""
+      for _authz_url in $(echo "$_authorizations_seg" | tr ',' ' ' ); do
+        _debug2 "_authz_url" "$_authz_url"
+        if ! response="$(_get "$_authz_url")"; then
+          _err "get to authz error."
+          _clearup
+          _on_issue_err "$_post_hook"
+          return 1
+        fi
+
+        response="$(echo "$response" | _normalizeJson)"
+        _debug2 response "$response"
+        _d="$(echo "$response" | _egrep_o '"value" *: *"[^"]*"' | cut -d : -f 2 | tr -d ' "')"
+        _debug2 _d "$_d"
+        _authorizations_map="$_d,$response
+$_authorizations_map"
+      done
+      _debug2 _authorizations_map "$_authorizations_map"
+    fi
+
     alldomains=$(echo "$_main_domain,$_alt_domains" | tr ',' ' ')
-    _index=1
+    _index=0
     _currentRoot=""
     for d in $alldomains; do
       _info "Getting webroot for domain" "$d"
+      _index=$(_math $_index + 1)
       _w="$(echo $_web_roots | cut -d , -f $_index)"
       _debug _w "$_w"
       if [ "$_w" ]; then
         _currentRoot="$_w"
       fi
       _debug "_currentRoot" "$_currentRoot"
-      _index=$(_math $_index + 1)
 
       vtype="$VTYPE_HTTP"
+      #todo, v2 wildcard force to use dns
       if _startswith "$_currentRoot" "dns"; then
         vtype="$VTYPE_DNS"
       fi
 
       if [ "$_currentRoot" = "$W_TLS" ]; then
-        vtype="$VTYPE_TLS"
+        if [ "$ACME_VERSION" = "2" ]; then
+          vtype="$VTYPE_TLS2"
+        else
+          vtype="$VTYPE_TLS"
+        fi
       fi
 
-      if ! __get_domain_new_authz "$d"; then
-        _clearup
-        _on_issue_err "$_post_hook"
-        return 1
+      if [ "$ACME_VERSION" = "2" ]; then
+        response="$(echo "$_authorizations_map" | grep "^$d," | sed "s/$d,//")"
+        _debug2 "response" "$response"
+        if [ -z "$response" ]; then
+          _err "get to authz error."
+          _clearup
+          _on_issue_err "$_post_hook"
+          return 1
+        fi
+      else
+        if ! __get_domain_new_authz "$d"; then
+          _clearup
+          _on_issue_err "$_post_hook"
+          return 1
+        fi
       fi
 
       if [ -z "$thumbprint" ]; then
@@ -3436,14 +3570,18 @@ issue() {
       token="$(printf "%s\n" "$entry" | _egrep_o '"token":"[^"]*' | cut -d : -f 2 | tr -d '"')"
       _debug token "$token"
 
-      uri="$(printf "%s\n" "$entry" | _egrep_o '"uri":"[^"]*' | cut -d '"' -f 4)"
+      if [ "$ACME_VERSION" = "2" ]; then
+        uri="$(printf "%s\n" "$entry" | _egrep_o '"url":"[^"]*' | cut -d '"' -f 4 | _head_n 1)"
+      else
+        uri="$(printf "%s\n" "$entry" | _egrep_o '"uri":"[^"]*' | cut -d '"' -f 4)"
+      fi
       _debug uri "$uri"
 
       keyauthorization="$token.$thumbprint"
       _debug keyauthorization "$keyauthorization"
 
       if printf "%s" "$response" | grep '"status":"valid"' >/dev/null 2>&1; then
-        _debug "$d is already verified, skip."
+        _debug "$d is already verified."
         keyauthorization="$STATE_VERIFIED"
         _debug keyauthorization "$keyauthorization"
       fi
@@ -3685,12 +3823,16 @@ issue() {
       return 1
     fi
 
-    if [ ! -z "$code" ] && [ ! "$code" = '202' ]; then
-      _err "$d:Challenge error: $response"
-      _clearupwebbroot "$_currentRoot" "$removelevel" "$token"
-      _clearup
-      _on_issue_err "$_post_hook" "$vlist"
-      return 1
+    if [ "$code" ] && [ "$code" != '202' ]; then
+      if [ "$ACME_VERSION" = "2" ] && [ "$code" = '200' ]; then
+        _debug "trigger validation code: $code"
+      else
+        _err "$d:Challenge error: $response"
+        _clearupwebbroot "$_currentRoot" "$removelevel" "$token"
+        _clearup
+        _on_issue_err "$_post_hook" "$vlist"
+        return 1
+      fi
     fi
 
     waittimes=0
@@ -3773,18 +3915,32 @@ issue() {
   _info "Verify finished, start to sign."
   der="$(_getfile "${CSR_PATH}" "${BEGIN_CSR}" "${END_CSR}" | tr -d "\r\n" | _url_replace)"
 
-  if ! _send_signed_request "${ACME_NEW_ORDER}" "{\"resource\": \"$ACME_NEW_ORDER_RES\", \"csr\": \"$der\"}" "needbase64"; then
-    _err "Sign failed."
-    _on_issue_err "$_post_hook"
-    return 1
-  fi
-
-  _rcert="$response"
-  Le_LinkCert="$(grep -i '^Location.*$' "$HTTP_HEADER" | _head_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
-  _debug "Le_LinkCert" "$Le_LinkCert"
-  _savedomainconf "Le_LinkCert" "$Le_LinkCert"
+  if [ "$ACME_VERSION" = "2" ]; then
+    if ! _send_signed_request "${ORDER_FINALIZE}" "{\"csr\": \"$der\"}"; then
+      _err "Sign failed."
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+    if [ "$code" != "200" ]; then
+      _err "Sign failed, code is not 200."
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+    Le_LinkCert="$(echo "$response"| tr -d '\r\n' | _egrep_o '"certificate" *: *"[^"]*"' | cut -d '"' -f 4)"
 
-  if [ "$Le_LinkCert" ]; then
+    if ! _get "$Le_LinkCert" > "$CERT_PATH"; then
+      _err "Sign failed, code is not 200."
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+  else
+    if ! _send_signed_request "${ACME_NEW_ORDER}" "{\"resource\": \"$ACME_NEW_ORDER_RES\", \"csr\": \"$der\"}" "needbase64"; then
+      _err "Sign failed."
+      _on_issue_err "$_post_hook"
+      return 1
+    fi
+    _rcert="$response"
+    Le_LinkCert="$(grep -i '^Location.*$' "$HTTP_HEADER" | _head_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
     echo "$BEGIN_CERT" >"$CERT_PATH"
 
     #if ! _get "$Le_LinkCert" | _base64 "multiline"  >> "$CERT_PATH" ; then
@@ -3798,6 +3954,12 @@ issue() {
     fi
 
     echo "$END_CERT" >>"$CERT_PATH"
+  fi
+
+  _debug "Le_LinkCert" "$Le_LinkCert"
+  _savedomainconf "Le_LinkCert" "$Le_LinkCert"
+
+  if [ "$Le_LinkCert" ]; then
     _info "$(__green "Cert success.")"
     cat "$CERT_PATH"
 
@@ -3825,29 +3987,37 @@ issue() {
   _cleardomainconf "Le_Vlist"
 
   Le_LinkIssuer=$(grep -i '^Link' "$HTTP_HEADER" | _head_n 1 | cut -d " " -f 2 | cut -d ';' -f 1 | tr -d '<>')
-  if ! _contains "$Le_LinkIssuer" ":"; then
-    _info "$(__red "Relative issuer link found.")"
-    Le_LinkIssuer="$_ACME_SERVER_HOST$Le_LinkIssuer"
-  fi
-  _debug Le_LinkIssuer "$Le_LinkIssuer"
-  _savedomainconf "Le_LinkIssuer" "$Le_LinkIssuer"
 
   if [ "$Le_LinkIssuer" ]; then
+    if ! _contains "$Le_LinkIssuer" ":"; then
+      _info "$(__red "Relative issuer link found.")"
+      Le_LinkIssuer="$_ACME_SERVER_HOST$Le_LinkIssuer"
+    fi
+    _debug Le_LinkIssuer "$Le_LinkIssuer"
+    _savedomainconf "Le_LinkIssuer" "$Le_LinkIssuer"
+
     _link_issuer_retry=0
     _MAX_ISSUER_RETRY=5
     while [ "$_link_issuer_retry" -lt "$_MAX_ISSUER_RETRY" ]; do
       _debug _link_issuer_retry "$_link_issuer_retry"
-      if _get "$Le_LinkIssuer" >"$CA_CERT_PATH.der"; then
-        echo "$BEGIN_CERT" >"$CA_CERT_PATH"
-        _base64 "multiline" <"$CA_CERT_PATH.der" >>"$CA_CERT_PATH"
-        echo "$END_CERT" >>"$CA_CERT_PATH"
+      
+      if [ "$ACME_VERSION" = "2" ]; then
+        if _get "$Le_LinkIssuer" >"$CA_CERT_PATH"; then
+          break
+        fi
+      else
+        if _get "$Le_LinkIssuer" >"$CA_CERT_PATH.der"; then
+          echo "$BEGIN_CERT" >"$CA_CERT_PATH"
+          _base64 "multiline" <"$CA_CERT_PATH.der" >>"$CA_CERT_PATH"
+          echo "$END_CERT" >>"$CA_CERT_PATH"
 
-        _info "The intermediate CA cert is in $(__green " $CA_CERT_PATH ")"
-        cat "$CA_CERT_PATH" >>"$CERT_FULLCHAIN_PATH"
-        _info "And the full chain certs is there: $(__green " $CERT_FULLCHAIN_PATH ")"
+          _info "The intermediate CA cert is in $(__green " $CA_CERT_PATH ")"
+          cat "$CA_CERT_PATH" >>"$CERT_FULLCHAIN_PATH"
+          _info "And the full chain certs is there: $(__green " $CERT_FULLCHAIN_PATH ")"
 
-        rm -f "$CA_CERT_PATH.der"
-        break
+          rm -f "$CA_CERT_PATH.der"
+          break
+        fi
       fi
       _link_issuer_retry=$(_math $_link_issuer_retry + 1)
       _sleep "$_link_issuer_retry"
@@ -3957,7 +4127,7 @@ renew() {
       _savedomainconf Le_API "$Le_API"
     fi
     if [ "$_OLD_STAGE_CA_HOST" = "$Le_API" ]; then
-      export Le_API="$STAGE_CA"
+      export Le_API="$DEFAULT_STAGING_CA"
       _savedomainconf Le_API "$Le_API"
     fi
     export ACME_DIRECTORY="$Le_API"