> ## Documentation Index
> Fetch the complete documentation index at: https://plain-docs-orca-916-agent-docs-restructure.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Customer

> The core customer entity. A customer only exists (ideally) once.
Uniqueness is guaranteed on both of these fields:
1. `externalId` if provided
2. `email`