Go to https://www.twilio.com/ and click on the "Sign up" button to create a new account. If you already have an account, log in to your account.
On the dashboard, you will see your Account SID and Auth token.
Copy your Account SID and Auth token and use them to authenticate twilio service.
Log in to https://portal.telnyx.com/
Click on the API Keys section on the left-hand side.
Click Create API Key.
You will then be provided with your APIv2 Key to copy.
If you lose it you can always go back to this section again to get it or create a new one.
Your ClickSend API credentials can be located within your account by clicking on the key icon in the top right corner of the dashboard.
From here, you can manage your credentials such as regenerating your API key.
The Auth ID and Auth Token can be found on the Plivo-Dashboard itself.