diff --git a/BTCPayServer/Views/Invoice/Checkout-Body.cshtml b/BTCPayServer/Views/Invoice/Checkout-Body.cshtml
index 7b035e8e9..5a655f745 100644
--- a/BTCPayServer/Views/Invoice/Checkout-Body.cshtml
+++ b/BTCPayServer/Views/Invoice/Checkout-Body.cshtml
@@ -109,6 +109,9 @@
         <span class="fa fa-angle-double-up"></span>
     </div>
     <line-items>
+        <div class="extraPayment" v-if="srvModel.status === 'new' && srvModel.txCount > 1">
+            {{$t("NotPaid_ExtraTransaction")}}
+        </div>
         <div class="line-items">
             <div class="line-items__item">
                 <div class="line-items__item__label">{{$t("Order Amount")}}</div>
diff --git a/BTCPayServer/wwwroot/checkout/css/normalizer.css b/BTCPayServer/wwwroot/checkout/css/normalizer.css
index 94b9b222d..fa440f64f 100644
--- a/BTCPayServer/wwwroot/checkout/css/normalizer.css
+++ b/BTCPayServer/wwwroot/checkout/css/normalizer.css
@@ -9448,10 +9448,10 @@ strong {
     margin-bottom: 5px;
 }
 
-.payment__scan svg {
-    width: 256px;
-    height: 256px;
-}
+    .payment__scan svg {
+        width: 256px;
+        height: 256px;
+    }
 
 .payment__scan__checkmark-wrapper {
     display: flex;
@@ -11202,6 +11202,16 @@ language-selector {
         opacity: 1;
     }
 
+
+.extraPayment {
+    background: #E5465A;
+    color: #fff;
+    font-weight: 500;
+    letter-spacing: .5px;
+    font-size: 12px;
+    padding: 2px 1rem;
+}
+
 line-items {
     background: #FBFBFB;
     border-top: 1px solid rgba(238, 238, 238, 0.5);
@@ -11470,56 +11480,63 @@ low-fee-timeline {
     height: 32px;
     margin-bottom: 10px;
 }
+
 .changelly-component .general__spinner bp-spinner {
     width: 50px;
     height: 50px;
-    
 }
 
-.changelly-component .general__spinner bp-spinner svg {
-    margin: 0;
-}
+    .changelly-component .general__spinner bp-spinner svg {
+        margin: 0;
+    }
 
 .changelly-component .retry-button {
     border-radius: 5px;
     border: 1px solid #a9a9a9;
     background: #fff;
     color: #000;
-    min-width:100px;  
+    min-width: 100px;
     padding-left: 0.8rem;
     padding-right: 0.8rem;
     min-height: 30px;
     word-break: break-all;
 }
 
-.changelly-component .retry-button :hover{
-    border-color: #7f7f7f;
-}
+    .changelly-component .retry-button :hover {
+        border-color: #7f7f7f;
+    }
 
 .changelly-component .prettydropdown li img {
-    width:20px; 
+    width: 20px;
     margin-right: 5px;
 }
 
 
-#prettydropdown-DefaultLang{
-    min-width:200px;
-}
-#prettydropdown-DefaultLang ul{
-    width:100%;
-}
-#prettydropdown-DefaultLang ul li{
-    width:100% !important;
+#prettydropdown-DefaultLang {
+    min-width: 200px;
 }
 
-[v-cloak] > * { display:none }
-[v-cloak]::before { content: "" }
+    #prettydropdown-DefaultLang ul {
+        width: 100%;
+    }
+
+        #prettydropdown-DefaultLang ul li {
+            width: 100% !important;
+        }
+
+[v-cloak] > * {
+    display: none
+}
+
+[v-cloak]::before {
+    content: ""
+}
 
 
 .btn-link {
     color: #329F80;
 }
 
-.btn-link:hover {
-    color: #24725B;
-}
+    .btn-link:hover {
+        color: #24725B;
+    }
diff --git a/BTCPayServer/wwwroot/checkout/js/core.js b/BTCPayServer/wwwroot/checkout/js/core.js
index 23cb6fcd0..01a725e02 100644
--- a/BTCPayServer/wwwroot/checkout/js/core.js
+++ b/BTCPayServer/wwwroot/checkout/js/core.js
@@ -107,6 +107,11 @@ function onDataCallback(jsonData) {
         jsonData.orderAmount = numberFormatted(jsonData.orderAmount * SATOSHIME);
     }
 
+    // expand line items to show details on amount due for multi-transaction payment
+    if (checkoutCtrl.srvModel.txCount === 1 && jsonData.txCount > 1) {
+        onlyExpandLineItems();
+    }
+
     // updating ui
     checkoutCtrl.srvModel = jsonData;
 }
@@ -140,10 +145,31 @@ function lndToggleNode() {
     checkoutCtrl.scanDisplayQr = checkoutCtrl.srvModel.peerInfo;
 }
 
+var lineItemsExpanded = false;
+function toggleLineItems() {
+    $("line-items").toggleClass("expanded");
+    lineItemsExpanded ? $("line-items").slideUp() : $("line-items").slideDown();
+    lineItemsExpanded = !lineItemsExpanded;
+
+    $(".buyerTotalLine").toggleClass("expanded");
+    $(".single-item-order__right__btc-price__chevron").toggleClass("expanded");
+}
+
+function onlyExpandLineItems() {
+    if (!lineItemsExpanded) {
+        toggleLineItems();
+    }
+}
+
+
 // private methods
 $(document).ready(function () {
     // initialize
     onDataCallback(srvModel);
+    // initial expand of line items to show error message if multiple payments needed
+    if (srvModel.status === "new" && srvModel.txCount > 1) {
+        onlyExpandLineItems();
+    }
 
     // check if the Document expired
     if (srvModel.expirationSeconds > 0) {
@@ -166,6 +192,11 @@ $(document).ready(function () {
     jQuery("invoice").fadeIn(300);
 
     // eof initialize
+    
+    // Expand Line-Items
+    $(".buyerTotalLine").click(function () {
+        toggleLineItems();
+    });
 
     // FUNCTIONS
     function hideEmailForm() {
@@ -297,17 +328,6 @@ $(document).ready(function () {
         // function to load contents in different language should go there
     });
 
-    // Expand Line-Items
-    var lineItemsExpanded = false;
-    $(".buyerTotalLine").click(function () {
-        $("line-items").toggleClass("expanded");
-        lineItemsExpanded ? $("line-items").slideUp() : $("line-items").slideDown();
-        lineItemsExpanded = !lineItemsExpanded;
-
-        $(".buyerTotalLine").toggleClass("expanded");
-        $(".single-item-order__right__btc-price__chevron").toggleClass("expanded");
-    });
-
     // Timer Countdown && Progress bar
     function progressStart(timerMax) {
         var end = new Date(); // Setup Time Variable, should come from server
diff --git a/BTCPayServer/wwwroot/locales/en.json b/BTCPayServer/wwwroot/locales/en.json
index 55b0c03b9..de8574231 100644
--- a/BTCPayServer/wwwroot/locales/en.json
+++ b/BTCPayServer/wwwroot/locales/en.json
@@ -1,3 +1,4 @@
+
 {
   "NOTICE_WARN": "THIS CODE HAS BEEN AUTOMATICALLY GENERATED FROM TRANSIFEX, IF YOU WISH TO HELP TRANSLATION COME ON THE SLACK http://slack.btcpayserver.org TO REQUEST PERMISSION TO https://www.transifex.com/btcpayserver/btcpayserver/",
   "code": "en",
@@ -46,5 +47,6 @@
   "txCount_plural": "{{count}} transactions",
   "Pay with CoinSwitch": "Pay with CoinSwitch",
   "Pay with Changelly": "Pay with Changelly",
-  "Close": "Close"
-}
\ No newline at end of file
+  "Close": "Close",
+  "NotPaid_ExtraTransaction": "The invoice hasn't been paid in full. Please send another transaction to cover amount Due."
+}