What’s the difference between WC() and $woocommerce

wc(); returns the singleton instance of WooCommerce to prevent the need to use globals.

WC sets the $woocommerce global this way: $GLOBALS['woocommerce'] = wc();, so using one or the other seems the same…

EDIT

About your errors, you got them because $woocommerce->session has not been set. WC initializes WC_Session_Handler only on frontend or CRON requests. Choose your action hook accordingly.

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