Go to Crypto.com
Log in or create a new account on https://crypto.com/exchange/
Open Profile page
Click on the profile icon in the top right corner of the page and open the Profile page:

Open API Keys tab

Enable 2FA security to be able to create API keys

Click "Create a new API key"

Name your key
When you have multiple APIs, a proper name helps to manage it.
Then enter 2FA code and click on Create API button:

Read and approve the Reminder
It is very important to store the Secret key somewhere safe so your funds will be protected!

Configure the settings and copy the API keys
Enable Trading permission;
Leave IP access restrictions as Unrestricted (learn more about IP addresses whitelisting here);
Copy and store the API keys in the safe place;
Click on Save button:

Connect Crypto.com exchange to 3Commas
Now you have all the needed information to connect your exchange with 3Commas.