tidy up some code locations

booking.paypal.inc

@@ -1,5 +1,34 @@
 <?php
 
+/**
+ * Helper function to calculate paypal fees
+ */
+function _booking_add_paypal_fees($amount, $country)
+{
+	//add the 30 cent fixed cost
+	$result = '0.00';
+	$result = (float) ($amount + (float) variable_get('booking_paypal_transaction_fee_fixedcost', '0.3'));
+	
+	//and the 2.6 percent transaction fee for australian transaction with no currency conversion
+	if ($country == variable_get('booking_default_country', 'Australia')) {
+		$percentage = (float) variable_get('booking_paypal_transaction_fee_percentage', '2.6');
+	} else {
+		$percentage = (float) variable_get('booking_paypal_transaction_fee_percentage_intl', '3.6');
+		//watchdog('booking', "Calculating paypal fees for a currency conversion transaction which adds $percentage percent.");		
+	}
+	
+	//apply the percentage
+	$percentage = (float) $percentage / 100;
+	//watchdog('booking', "Paypal percentage transaction fee works out to $percentage.");
+	$result = $result / (1 - $percentage);
+	
+	//return result
+	return $result;
+}
+
+/**
+ * Helper function to generate string to post to paypal to verify a successful IPN
+ */
 function _booking_paypal_post($data = array()) {
   $post = '';
   foreach ($data as $key => $value) {
@@ -10,7 +39,10 @@ function _booking_paypal_post($data = array()) {
   return $post;
 }
 
-//see https://github.com/paypal/ipn-code-samples/blob/master/paypal_ipn.php for more details
+/**
+ * Helper function to verify a successful IPN from Paypal 
+ * @see https://github.com/paypal/ipn-code-samples/blob/master/paypal_ipn.php
+ */
 function _booking_paypal_ipn_verify($vars = array()) {
 
   if (variable_get('booking_paypal_sandbox', 0)) {