Retrieve Gainsight data using SFDC AccountId

Customer has the following query:

Hi, Can you please help me with your Person api. We are building a solution to programmatically delete users from Gainsight but the only way to identify user in your api is by specifying emails or extranal ids. This doesnt always fit our requirements as we have active Salesforce integration and would like to identify all users in specific company that corresponds to to Salesforce Ids in Company person object. Hence, is there a way to compile and retrieve API response where we can specify SfdcAccountId and get result of all People that match that criteria?