Upsert User

Create or update a user. Upsert is idempotent.

Request body

Field	Type	Required	Description
`id`	string	Yes	Your app's user ID
`name`	string	No	User's display name
`email`	string	No	User's email
`metadata`	object	No	Arbitrary key-value pairs

{
  "id": "user_123",
  "name": "Alice",
  "email": "alice@example.com",
  "metadata": { "plan": "pro" },
  "created_at": "2025-01-15T10:30:00Z"
}

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