On/Off-ramp Webhooks

After every order that is confirmed by a user, Sardine will fire off a webhook to a URL designated by the developer.

webhook	description
draft	User has created an order
expired	User did not confirm the purchase
declined	User attempted a purchase but their payment attempt was declined
processing	Order was confirmed, waiting for payment
processed	Payment was processed successfully
complete	Order was executed and delivered to user

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