diff --git a/C4/SIP/Sip/MsgType.pm b/C4/SIP/Sip/MsgType.pm
index 37b34c0304..45f9e8fac6 100644
--- a/C4/SIP/Sip/MsgType.pm
+++ b/C4/SIP/Sip/MsgType.pm
@@ -20,6 +20,7 @@ use C4::Auth qw(&check_api_auth);
 
 use Koha::Patrons;
 use Koha::Patron::Attributes;
+use Koha::Plugins;
 use Koha::Items;
 
 use UNIVERSAL::can;
@@ -520,6 +521,7 @@ sub handle_checkout {
     $fields = $self->{fields};
 
     $patron_id = $fields->{ (FID_PATRON_ID) };
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
     $item_id   = $fields->{ (FID_ITEM_ID) };
     my $fee_ack = $fields->{ (FID_FEE_ACK) };
 
@@ -741,6 +743,8 @@ sub handle_block_patron {
     $patron_id        = $fields->{ (FID_PATRON_ID) };
     $terminal_pwd     = $fields->{ (FID_TERMINAL_PWD) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     # Terminal passwords are different from account login
     # passwords, but I have no idea what to do with them.  So,
     # I'll just ignore them for now.
@@ -965,6 +969,8 @@ sub handle_patron_info {
     $start        = $fields->{ (FID_START_ITEM) };
     $end          = $fields->{ (FID_END_ITEM) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     $patron = $ils->find_patron($patron_id);
 
     $resp = (PATRON_INFO_RESP);
@@ -1122,6 +1128,8 @@ sub handle_fee_paid {
     $fee_id     = $fields->{ (FID_FEE_ID) };
     $trans_id   = $fields->{ (FID_TRANSACTION_ID) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     $ils->check_inst_id( $inst_id, "handle_fee_paid" );
 
     my $pay_result = $ils->pay_fee( $patron_id, $patron_pwd, $fee_amt, $fee_type, $pay_type, $fee_id, $trans_id, $currency, $is_writeoff, $disallow_overpayment, $register_id );
@@ -1324,6 +1332,8 @@ sub handle_patron_enable {
     $patron_id  = $fields->{ (FID_PATRON_ID) };
     $patron_pwd = $fields->{ (FID_PATRON_PWD) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     siplog( "LOG_DEBUG", "handle_patron_enable: patron_id: '%s', patron_pwd: '%s'", $patron_id, $patron_pwd );
 
     $patron = $ils->find_patron($patron_id);
@@ -1387,6 +1397,8 @@ sub handle_hold {
     $title_id    = $fields->{ (FID_TITLE_ID) } || '';
     $fee_ack     = $fields->{ (FID_FEE_ACK) } || 'N';
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     if ( $hold_mode eq '+' ) {
         $status = $ils->add_hold( $patron_id, $patron_pwd, $item_id, $title_id, $expiry_date, $pickup_locn, $hold_type, $fee_ack );
     } elsif ( $hold_mode eq '-' ) {
@@ -1452,6 +1464,8 @@ sub handle_renew {
     $item_props = $fields->{ (FID_ITEM_PROPS) };
     $fee_ack    = $fields->{ (FID_FEE_ACK) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     $status = $ils->renew( $patron_id, $patron_pwd, $item_id, $title_id, $no_block, $nb_due_date, $third_party, $item_props, $fee_ack );
 
     $patron = $status->patron;
@@ -1533,6 +1547,8 @@ sub handle_renew_all {
     $terminal_pwd = $fields->{ (FID_TERMINAL_PWD) };
     $fee_ack      = $fields->{ (FID_FEE_ACK) };
 
+    ($patron_id) = Koha::Plugins->call('patron_barcode_transform', $patron_id ) || $patron_id;
+
     $status = $ils->renew_all( $patron_id, $patron_pwd, $fee_ack );
 
     $resp .= $status->ok ? '1' : '0';
diff --git a/Koha/Patron.pm b/Koha/Patron.pm
index c24f74ac71..a5a86c4684 100644
--- a/Koha/Patron.pm
+++ b/Koha/Patron.pm
@@ -111,7 +111,10 @@ Autogenerate next cardnumber from highest value found in database
 
 sub fixup_cardnumber {
     my ( $self ) = @_;
-    my $max = Koha::Patrons->search({
+
+    my ( $max ) = Koha::Plugins->call( 'barcode_generate', 'patron', $self );
+
+    $max ||= Koha::Patrons->search({
         cardnumber => {-regexp => '^-?[0-9]+$'}
     }, {
         select => \'CAST(cardnumber AS SIGNED)',
@@ -198,6 +201,9 @@ sub store {
 
             $self->trim_whitespaces;
 
+            my ( $new_cardnumber ) = Koha::Plugins->call( 'patron_barcode_transform', $self->cardnumber ) || $self->cardnumber;
+            $self->cardnumber( $new_cardnumber );
+
             # Set surname to uppercase if uppercasesurname is true
             $self->surname( uc($self->surname) )
                 if C4::Context->preference("uppercasesurnames");
diff --git a/circ/circulation.pl b/circ/circulation.pl
index 55fe588706..4bbb44479e 100755
--- a/circ/circulation.pl
+++ b/circ/circulation.pl
@@ -75,7 +75,8 @@ my $autoswitched;
 my $borrowernumber = $query->param('borrowernumber');
 
 if (C4::Context->preference("AutoSwitchPatron") && $barcode) {
-    if (Koha::Patrons->search( { cardnumber => $barcode} )->count() > 0) {
+    my ( $new_barcode ) = Koha::Plugins->call( 'patron_barcode_transform', $findborrower ) || $findborrower;
+    if (Koha::Patrons->search( { cardnumber => $new_barcode} )->count() > 0) {
         $findborrower = $barcode;
         undef $barcode;
         undef $borrowernumber;
@@ -220,6 +221,7 @@ if ( @$barcodes == 0 && $charges eq 'yes' ) {
 #
 my $message;
 if ($findborrower) {
+    ( $findborrower ) = Koha::Plugins->call( 'patron_barcode_transform', $findborrower ) || $findborrower;
     my $patron = Koha::Patrons->find( { cardnumber => $findborrower } );
     if ( $patron ) {
         $borrowernumber = $patron->borrowernumber;
diff --git a/members/memberentry.pl b/members/memberentry.pl
index 3cb66aeb29..57feaa3221 100755
--- a/members/memberentry.pl
+++ b/members/memberentry.pl
@@ -44,6 +44,7 @@ use Koha::Patron::Attribute::Types;
 use Koha::Patron::Categories;
 use Koha::Patron::HouseboundRole;
 use Koha::Patron::HouseboundRoles;
+use Koha::Plugins;
 use Koha::Token;
 use Koha::SMS::Providers;
 
@@ -324,6 +325,9 @@ if ($op eq 'save' || $op eq 'insert'){
     # If the cardnumber is blank, treat it as null.
     $newdata{'cardnumber'} = undef if $newdata{'cardnumber'} =~ /^\s*$/;
 
+    my ( $new_barcode ) = Koha::Plugins->call( 'patron_barcode_transform', $newdata{'cardnumber'} ) || $newdata{'cardnumber'};
+    $newdata{'cardnumber'} = $new_barcode;
+
     if (my $error_code = checkcardnumber( $newdata{cardnumber}, $borrowernumber )){
         push @errors, $error_code == 1
             ? 'ERROR_cardnumber_already_exists'
diff --git a/opac/sco/sco-main.pl b/opac/sco/sco-main.pl
index 486b9d793d..1199d2a093 100755
--- a/opac/sco/sco-main.pl
+++ b/opac/sco/sco-main.pl
@@ -120,6 +120,7 @@ if (C4::Context->preference('SelfCheckoutByLogin') && !$patronid) {
 
 my ( $borrower, $patron );
 if ( $patronid ) {
+    ( $patronid ) = Koha::Plugins->call( 'patron_barcode_transform', $patronid ) || $patronid;
     $patron = Koha::Patrons->find( { cardnumber => $patronid } );
     $borrower = $patron->unblessed if $patron;
 }