Allows canceling a subscription with all supported attributes

[blakeprudhomme]

Supported Attributes:

• cancellation_message
• ~cancellation_method~
• reason_code

API reference https://reference.chargify.com/v1/subscriptions-cancellations#cancel-subscription-2

Closes #160

[wsmoak]

Thanks! We're actually checking on whether cancellation_method was meant to be exposed as an input attribute, so once we get that sorted out we can take a look at this.

[blakeprudhomme]

Ok that makes sense. It's not really needed for us, I just added it while I was making the update since the API exposed it.

I noticed that the API says: cancellation_method : null or string

but have seen "cancellation_method"=>0, returned with the subscription object

[wsmoak]

Sorry for the delay on this and the misleading docs! We've updated them to remove the cancellation_method as an input attribute https://reference.chargify.com/v1/subscriptions-cancellations/cancel-subscription

It's present in the output, but it isn't something you can set.

If you'd like to update this to remove the use of cancellation_method in the input, we can review it, or if you don't want to spend more time time on it we can just go ahead and add this separately.

Thanks again for your work on it!

[YesThatAllen]

And for those who need to be able to set the method, so we can make use of your new churn metrics? 🙏

[blakeprudhomme]

@wsmoak cancellation_method removed. 👍