Yes, you can accept and reject incoming orders. However, keep in mind that rejected orders can have a negative impact on an Excellence Score.
If you have already accepted an order but wish to cancel it, you can do so in the delivery overview. In the righthand corner of the delivery overview you can click on a cross to reassign the order to another courier.
Yes, if you frequently reassign incoming orders or orders that have already been accepted, it can negatively affect your Excellence Score, since it affects the usage of the app of customers, partners and other couriers.