WC_Product_PW_Gift_Card == WC_Gift_Voucher_Product

PWGC_GIFT_CARD_NUMBER_META_KEY == WPGV_GIFT_VOUCHER_NUMBER_META_KEY

pw-woocommerce-gift-cards == gift-voucher

pw_gift_cards == wpgv_gift_voucher

gift_card_meta == gift_voucher_meta