Thank you for your query.
You can find the API key / Secret in the Admin section of your account. Please follow these steps -> Click on the drop-down menu and select 'Admin' >Click on the 'Users' and then select the User. Once you have selected the user, you can see the API key / secret in the right section of the window.
If you are unable to view the Admin section, please contact your Client Admin. Only Client Admin has the capability to view the Admin section of the account.
Hope this helps.