After the identification rules are applied to Active Directory and ServiceNow connectors, the assets are identified or discovered from their machines.
But in the case of Webhook connectors, after you apply the identification rule, you must send the API request so that the Webhook connectors can identify or discover the assets and bring them to the CSAM inventory. For more information, refer to the "Import Third-Party Assets API" section from the API v2 User Guide.
Note: The API batch file size cannot be more than 10 MB, and a maximum of 1000 assets are supported in a single API call.