diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/pos/pay.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/pos/pay.tt
index cb30d5456f..3e927e012f 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/pos/pay.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/pos/pay.tt
@@ -64,6 +64,7 @@
 
         <form name="payForm" id="payForm" method="post" action="/cgi-bin/koha/pos/pay.pl">
             [% INCLUDE 'csrf-token.inc' %]
+            <input type="hidden" name="op" value="cud-pay">
             <div class="row">
 
                 <div class="col-md-6">
diff --git a/pos/pay.pl b/pos/pay.pl
index 3c6f2a2d5e..45cd1119c8 100755
--- a/pos/pay.pl
+++ b/pos/pay.pl
@@ -58,30 +58,32 @@ my $invoice_types =
     {}, $library_id );
 $template->param( invoice_types => $invoice_types );
 
-my $total_paid = $input->param('paid');
-if ( $total_paid and $total_paid ne '0.00' ) {
-    my $cash_register = Koha::Cash::Registers->find( { id => $registerid } );
-    my $payment_type  = $input->param('payment_type');
-    my $sale          = Koha::Charges::Sales->new(
-        {
-            cash_register => $cash_register,
-            staff_id      => $logged_in_user->id
+if ( $op eq 'cud-pay' ) {
+    my $total_paid = $input->param('paid');
+    if ( $total_paid and $total_paid ne '0.00' ) {
+        my $cash_register = Koha::Cash::Registers->find( { id => $registerid } );
+        my $payment_type  = $input->param('payment_type');
+        my $sale          = Koha::Charges::Sales->new(
+            {
+                cash_register => $cash_register,
+                staff_id      => $logged_in_user->id
+            }
+        );
+
+        my @sales = $input->multi_param('sales');
+        for my $item (@sales) {
+            $item = from_json $item;
+            $sale->add_item($item);
         }
-    );
 
-    my @sales = $input->multi_param('sales');
-    for my $item (@sales) {
-        $item = from_json $item;
-        $sale->add_item($item);
+        my $payment = $sale->purchase( { payment_type => $payment_type } );
+
+        $template->param(
+            payment_id => $payment->accountlines_id,
+            collected  => scalar $input->param('collected'),
+            change     => scalar $input->param('change')
+        );
     }
-
-    my $payment = $sale->purchase( { payment_type => $payment_type } );
-
-    $template->param(
-        payment_id => $payment->accountlines_id,
-        collected  => scalar $input->param('collected'),
-        change     => scalar $input->param('change')
-    );
 }
 
 if ( $op eq 'cud-send' ) {