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"System.Customer.UserImportClassName" - Optional attribute. This is the name of the class that inherits from the default CustomerUserIntegration UserImporter class. (e..g "CUKIntegrationCUKUserImporter" for CUKIntegrationCUKUserImporter.cs : CustomerUserIntegrationUserImporter.cs)
"System.Customer.UserImportCsvDelimiter" – Optional attribute. Used to override the default CSV delimiter (',') with another char. (e.g. '|' for CCL. String used as Regex). Because attributes are stored as a string, only put the character itself in the Value, not the single quotes.
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