When setting up your Senta integration you will be asked for an access key and sub-domain name.
Where To Find This Information
Getting the access key
To get your access key open another browser and login to Senta. Go to Settings > Users > Add Integration. You'll be prompted to name the integration (e.g. goproposal). Hit 'Generate API key' and copy this key.
Getting the subdomain name
Your senta subdomain is the URL of your senta workspace without the “https://” or the “.senta.co."
Read this article for information on the other steps you need to take to get this working nicely.