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If your business requires you to send out targeted emails to customers, based on specific criteria; keep in mind that within Chargebee, customer-level emails such as 'Customer created' email can only be segmented by a segment created from the Customer Index page in Chargebee. The same applies to subscription and invoice-related emails as well. Chargebee does not support creation and usage of segments across entities.
For customer-level emails such as 'Customer created' email, you would be able to create a Customer-level segment that is made up of a bunch of filters at the customer level.
Here’s a video showing how you can create a segment at the customer level and associate it with a customer-level email notification
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