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You must use an active Sage Intacct Web Services developer license (Platform Services module). DATABASICS' sender id (“DATABASICS”, see example below) and password allows DATABASICS to post data to Intacct with a credentialed an authorized xml gateway account.
A sender ID can be authorized for more than one company and can be tracked through an audit history report.
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Go to Company > Company > Security > scroll to Content Security Policy and if the Enforce content security policy checked then make sure you add the URLs for DATABASICS intacct service and enable Java Script for both production and test.
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References:
https://developer.Web Services users (intacct.com/web-services/