Gravity Form Unique Order Number generator

Create a Hidden Field and after that Allow field to populate dynamically and add this parameter “order_summary” and add the below function

add_filter( 'gform_field_value_order_summary', 'order_summary_population_function' );
function order_summary_population_function( $value ) {
 $prefix = 'TSC'.get_the_ID().'-'.time();
    return $prefix;
}