400 errors when creating a new custom integration

Running:

with sunshine_conversations_client.ApiClient(self.__sunco_config) as api_client:
    api_instance = sunshine_conversations_client.IntegrationsApi(api_client)
        integration = sunshine_conversations_client.Integration(
            type="custom"
        )
    try:
        api_response = api_instance.create_integration(self.__sunco_app_id, integration)
        pprint(api_response)
    except sunshine_conversations_client.ApiException as e:
        print("Exception when calling IntegrationsApi->create_integration: %s\n" % e)

Results in:
HTTP response body: {"errors":[{"code":"bad_request","title":"should have required property 'webhooks'"}]}

As far as I can tell webhooks is not required when creating a new custom integration, it is not clear to me where I should even be setting this.

Start at the IntegrationsApi.create_integration entry point and the Integration model used in the report's example. Trace how the custom integration request is built and validated, then compare that behavior with the API's requirement for webhooks. Done means the reported custom-integration request behaves consistently with the documented requirement.