Allow Breww to update a Sellar order's payment status and expected dispatch/delivery date

Currently, Breww just pulls payment information from Sellar. If an order comes through from Sellar to Breww as unpaid initially, and then a payment is added to Breww (either manually, or via an accounting integration), then this payment status is not pushed to Sellar. This feature request is to add support for pushing this payment status information to Sellar.

Additionally, if a delivery is scheduled in Breww (or the date of this delivery is changed), then Breww could update this information on Sellar automatically on your behalf.

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