Customizing Event Espresso Infusionsoft addon to have country dropdown and special product fields, as requested on http://eventespresso.com/topic/infusionsoft-add-on-doesnt-work-properly-no-contact-data-payment/#post-88125

functions.php

<?php 
//...
/**
 * Changes the original, regular country input used in infusionsoft to a dropdown
 * @param string $original_html
 * @param string $country
 * @return string
 */
function ee_is_swap_country($original_html,$country){
	$values = array(
		array('id'=>'germany','text'=>  __("Germany", 'event_espresso')),
		array('id'=>'france','text'=>  __("France", 'event_espresso')),
		//add any other cuontries you want to accept
	);
	return select_input('country', $values, $country);
}
add_filter('filter_hook_espresso_infusionsoft_billing_country_input','ee_is_swap_country',10,3);

/**
 * Adds custom data to IS products
 * @param array $original_info_to_send as documented on http://help.infusionsoft.com/developers/tables/product 
 * @param array $payment_details like columsn on the event_details table
 * @return array
 */
function ee_is_new_product_details($original_info_to_send,$payment_details){
	$original_info_to_send['Taxable'] = 1;
	$original_info_to_send['CountryTaxable'] = 1;
	return $original_info_to_send;
}
add_filter('filter_hook_espresso_infusionsoft_event_product_data','ee_is_new_product_details',10,3);