woocommerce_after_calculate_totals action-hookWC 1.0

Usage

add_action( 'woocommerce_after_calculate_totals', 'wp_kama_woocommerce_after_calculate_totals_action' );

/**
 * Function for `woocommerce_after_calculate_totals` action-hook.
 * 
 * @param  $that 
 *
 * @return void
 */
function wp_kama_woocommerce_after_calculate_totals_action( $that ){

	// action...
}
$that
-

Where the hook is called

WC_Cart::calculate_totals()
woocommerce_after_calculate_totals
woocommerce/includes/class-wc-cart.php 1410
do_action( 'woocommerce_after_calculate_totals', $this );

Where the hook is used in WooCommerce

woocommerce/includes/class-wc-cart-session.php 73
add_action( 'woocommerce_after_calculate_totals', array( $this, 'set_session' ), 1000 );