Woocommerce订阅中的订阅频率和价格变化挂钩

Question

Maybe I overlooked it, but as much as I searched, I could not find which action to hook when a subscription changes price or frequency in Woocommerce Subscriptions.

The documentation says that to support price changes in your payment gateway you have to list subscription_amount_changes, but nowhere it says which function will be called when the amount actually changes..

Also in the Action reference I was unable to find an action hook which is called when the subscription amount or frequency changes. If anyone has a clue which hook to use or how to implement this particular feature, please tell me.

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Edit

Ok thanks for the comments and answer by @Reigel, so if I understand correctly the change of a subscription in the admin menu (which I indeed refer to), has to be handled by the save_post action. Could you provide a small example how to hook this action and check if it is a subscription and get the $order_id (I guess this is the same as post_id?) to use in the subscription management calls?

Thank you very much already!

Answer 1

I will try to explain about supports.

subscription_amount_changes is just a support and will not fire anything. You can use it for conditional statements, like:

if ( !$chosen_gateway->supports( 'subscription_amount_changes' )) { 
     echo 'Please be considerate and do not change the price for the chosen gateway does not support it.';
}

now, other plugins can then check if the chosen gateway supports subscription_amount_changes and do their appropriate actions.

action hook which is called when the subscription amount or frequency changes

subscription is just a product type. Which means this is just a post with a post_type of product. The amount and frequency are just post meta. all are handled on save_post action. add_action( 'save_post', __CLASS__ . '::save_subscription_meta', 11 );. This is on the post_type=product. You have to check also for save_post on post_type=shop_order as it's more appropriate for checking support. Because there's already a gateway chosen.