You cannot add payment methods anymore. This is due to a change in the label property. The method addPaymentGateway is not called right. The label is moved to the options.

Solution in WebGUI/Shop/Pay.pm (#237)

change:

my $payDriver = $self->addPaymentGateway( $className, $className->getName( $session ), { enabled => 0 } );

in:

    my $driverName = $className->getName( $session );
    my $payDriver = $self->addPaymentGateway( $className, { enabled => 0, label => $driverName });