what hook when push button "processing"

Hi, after users buy products by “Direct Bank Transfer”
My order need “processing”.

When I push “processing” button in wp-admin, what kind of hook will send?
Now I added two hooks but nothing happened.
add_action(‘woocommerce_order_status_completed‘, array(__CLASS__, ‘completeOrder’));
add_action(‘subscriptions_activated_for_order‘, array(__CLASS__, ‘completeOrder’));

https://ww.wp.xz.cn/plugins/woocommerce/