Log in to your Sendinblue account.
Go to profile (as shown in picture) and click on SMTP & API.
Now copy V3 Api Key ( highlighted in picture ) and write it somewhere.
Now you have V3 Api Key.
In you CallHippo account -
Log in to your account and go to the integrations tab.
Now click on +integrate button and you will be redirected to another page.
Now click on +Connect Your Sendinblue and Enter you Api Key which you copied earlier and click on Save.
Now it should say Datasource is linked. Click on Ok.
Now click on next and your will be redirected to your callhippo account and your status will be changed to Integrated.
You have successfully integrated your Sendinblue account with callhippo.