Detecting version of WooCommerce for Payment Gateways to make them compatible with WC 2.0

gistfile1.php

<?php

/*
 * Use this in __construct() to set appropriate options update
 */
if ( preg_match('/1\.[0-9]*\.[0-9]*/', WOOCOMMERCE_VERSION )){
	// 1.*.*
	add_action('woocommerce_update_options_payment_gateways', array( $this, 'process_admin_options'));
} else {
	// 2.*.*
	add_action('woocommerce_update_options_payment_gateways_' . $this->id, array( $this, 'process_admin_options'));
}



/*
 * Use this in the process_payment() method to clear the awaiting payment flag
 */
// Empty awaiting payment session
if ( preg_match('/1\.[0-9]*\.[0-9]*/', WOOCOMMERCE_VERSION )){
	unset($_SESSION['order_awaiting_payment']);
} else {
	unset( $woocommerce->session->order_awaiting_payment );
}

@growdev could use version_compare instead of preg_match -- it's designed for this sort of thing 😄

Know that now. I like getting my regex on!