It depends. Most of the times, request are sent from your browser to the server, same way as manual betting. AFAIK, the server is unable to distinguish between bot and non bot bets. Verification should still be made however. It is harder for bets in automated betting to be verified due to the speed.
If the site uses nonce in the provably fair system, there shouldn't be much problem in verifying bets in automated betting. After all, with the server seed (obtained after the betting session is over) and client seed, you should be able to get the rolled numbers locally and run your bot logic using those numbers to check what your session profit or loss should be. If the site doesn't use nonce, verification would be a lot harder, as you will need to record the seed pairs of each of your bets automatically.