Driver Tip now included in Dispatch API

Online ordering platforms will in certain cases provide a tip intended for the courier who is handling the delivery.

Where the customer is using a Dispatch service integrated with Deliverect, we will now be sending the attribute as "driverTip": 500, where 2 decimal digits apply, this example would be e.g. $5.00

Dispatch partners can expect this information to be displayed in both the initial validation webhook and also when the delivery job is created.