I fix my problem with that :
function upv_woo_wallet_credit_purchase_amount($order_sub_total, $order_id) {
$order = wc_get_order( $order_id );
return $order->get_total();
}
add_filter(‘woo_wallet_credit_purchase_amount’, ‘upv_woo_wallet_credit_purchase_amount’, 10, 2);