I deployed Discord on Heroku successfully, but it still doesn't work. It runs fine locally, but I can't get response from Heroku hosted variant. Here's Github repository: https://github.com/MidnightSonor/malifaux_discord_bot. Here's runtime log.
2022-10-13T12:44:01.000000+00:00 app[api]: Build started by user dashevsky.andry@gmail.com
2022-10-13T12:44:22.188723+00:00 app[api]: Release v18 created by user dashevsky.andry@gmail.com
2022-10-13T12:44:22.188723+00:00 app[api]: Deploy 56113237 by user dashevsky.andry@gmail.com
2022-10-13T12:44:24.832319+00:00 heroku[worker.1]: State changed from crashed to starting
2022-10-13T12:44:26.000000+00:00 app[api]: Build succeeded
2022-10-13T12:44:26.365888+00:00 heroku[worker.1]: Starting process with command `python3 main.py`
2022-10-13T12:44:26.952729+00:00 heroku[worker.1]: State changed from starting to up
2022-10-13T12:44:27.929643+00:00 app[worker.1]: [2022-10-13 12:44:27] [INFO ] discord.client: logging in using static token
2022-10-13T12:44:28.683273+00:00 app[worker.1]: [2022-10-13 12:44:28] [INFO ] discord.gateway: Shard ID None has connected to Gateway (Session ID: bf35f7b917978582c1cb6a861dba38eb).
2022-10-13T12:44:30.686669+00:00 app[worker.1]: Malifaux Deck Bot#4754 has connected to Discord!
Thanks to @Chris and @DenverCoder1 I got the answer. But it's mostly general recommendations and notes for discord.py and heroku firsttimers:
heroku remote
.client
or bot
types! I used discord.Client(intents=discord.Intents.all())
for this purpose.