Set default values for line items

functions.php

<?php // don't add this line since it's already in your functions.php file

function si_rate_default( $columns = array(), $type ) {
	 
	if ( '' != $type || 'default' != $type ) {
		return $columns;
	}
  
	$columns['rate']['value'] = 125;
	$columns['qty']['value'] = 1;
	$columns['tax']['value'] = 0;
	$columns['total']['value'] = 125;
	
	return $columns;
}
add_filter( 'si_line_item_columns', 'si_rate_default', 10, 2 );

This snippet is a customization for Sprout Invoices. A customizable solution that provides a way for you to get paid via your WordPress site. For more information please don't hesitate to reach out.