You can contact Karl Andersson at kandersson @roku.com with your information and he will be able to set up a report for you. He is very good at responding to emails and you should hear back from him within 1 - 3 business days.
A little bit more information on RAF ads:
Currently there is no dashboard to see ad performance on the Roku website, but Karl can set you up to receive automatic reports to your email. Just let him know how often you would like to receive these reports (daily, weekly, monthly, etc).
The minimum threshold to receive payout is $100, quarterly.