Send total without discount

send total without discount.php

<?php
// NOTE: THE CODE TO COPY/PASTE STARTS BELOW THIS LINE

/* Change 10 in gform_submission_data_pre_process_payment_10 to your form id number (e.g. gform_submission_data_pre_process_payment_1 form id 1)
or remove the _10 to apply this to all forms */
add_filter( 'gform_submission_data_pre_process_payment_10', 'modify_submission_data', 10, 4 );

function modify_submission_data( $submission_data, $feed, $form, $entry ) {
	GFCommon::log_debug( __METHOD__ . '(): running.' );

	// Change the payment amount only for subscription feeds.
	if (  $feed['meta']['transactionType'] != 'subscription' ) {
		GFCommon::log_debug( __METHOD__ . '(): Not a subscription feed: ' . $feed['meta']['transactionType'] );
		return $submission_data;
	}

	// Change 5 in the following line to the id of the field that has the total amount without discount.
	// IMPORTANT! It can't be a Total field type, or the snippet will be useless.
	$submission_data['payment_amount'] = rgar( $entry, '5' );
	GFCommon::log_debug( __METHOD__ . '(): Amount before discount passed to Stripe: ' . $submission_data['payment_amount'] );

	return $submission_data;
}

Hi there. I'm not sure the code above is 100% correct Samuel. I've tested this now on our site: www.register.za.com. If I declare this variable: $total_field = rgar( $entry, '13' ) it equals the new total including the discount. My total field ID is 13. It needs pass the total prior to the discount which on our form is a hidden form field with a name: "gf_total_no_discount_2". How would I get this variable from calling rgar() function?

Many thanks

Ken