PHP Fatal error WooCommerce 3.0

Olá, tudo bem?

Ao atualizar o WooCommerce para 3.0 não consegui mais concluir um pedido na minha loja. Aparece um tal de Internal Server Error no último passo do checkout, quando deveria processar o pedido. Gerei o log de erro:

[05-Apr-2017 22:14:29 UTC] PHP Fatal error: Call to undefined method WC_Order::get_order_discount() in /home/wwwnanacarecom/public_html/wp-content/plugins/bling-woocommerce/includes/class-wc-bling-api.php on line 212

O plugin do Bling está ativo na loja, mas não estamos utilizando, podemos simplesmente desativá-lo?

Além desse erro, há outros relacionados aos campos do formulário que ainda estão acontecendo, como reportado no suporte do PagSeguro:

[05-Apr-2017 22:14:29 UTC] order_date was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_first_name was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_last_name was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_cpf was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_rg was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_address_1 was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_number was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_address_2 was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_address_2 was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_neighborhood was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_neighborhood was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_postcode was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_city was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_state was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_phone was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] billing_email was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.
[05-Apr-2017 22:14:29 UTC] shipping_method_title was called incorrectly. Order properties should not be accessed directly.. This message was added in version 3.0.

Obrigado pela atenção.