I've been thinking of compiling an all-inclusive post and asking they make it a sticky. To answer your question you can email:
publisherAdServices@roku.com and include your channel name and email address for the account. Please ask to receive reporting and let them know if you'd like daily/weekly/monthly reports. It will show you total ad impressions for the period, unfortunately it won't give exact $ amounts. You can gauge from the impressions ($14 per 1000) an estimate, then factor in the 60/40 split. I believe payment is paid out on a quarterly basis and pays 1 quarter behind (So Q1 will pay out sometime after June 30th). This is what I heard, although maybe that is only for the first month. The payout has to be over $100, otherwise I suppose it's retained until the payout period when it reaches $100.
For those looking to signup for RAF please email
enrollment@roku.com and include your channel name and email address on the account and your paypal email address. If you wish to save a step you can probably include a W9 in your email because that's essentially all they need.
RAF is only available to US only channels. I believe only 1 ad is shown per break.
[EDITED by RokuTomC: Updated the legacy "rokuadops@roku.com" email to "publisherAdServices@roku.com"]