Go to HitBTC
Log in or create a new account on https://hitbtc.com/.
Open account dashboard
Click "Settings" on the top right corner.
Follow to API
Switch to "API Keys" tab.
Click "New API key"
Note the secret key
You can also request it to email later.
Select permissions
You must enable:
Order book, History, Trading balance
Place/cancel orders
Payment information
You'll need to confirm with email or 2FA the second permission.
Add HitBTC to 3Commas
Check how to connect API to 3Commas.
If you didn't note the secret key, request it to email.
Don't forget to transfer funds to Trading Account
You can't access and trade with funds on Main Account.
You can transfer funds between accounts on the page https://hitbtc.com/account.