Ometria uses various methods of order attribution, including last click.
If you are only interested in last click attribution - i.e. the last place a contact clicked before arriving at your site and placing an order, check the Visit medium column in the Orders grouped report.
The data in this column comes from UTM parameters, and will tell you where the contact 'came from' immediately before arriving on your site, without taking coupon codes or your attribution time window into consideration.
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