User context object

The following table describes the keys in the user context object:

Key	Type	Description	Value
`user_id`	string	User ID identified by the developer. Note You must specify either `user_id` or `uuid` to allow user activity tracking and assignment to active experiments if any.	n/a
`uuid`	string	User ID identified by Discover.	n/a
`gender`	string	User gender.	`male` `female`
`email`	string	User email address.	n/a
`order_id`	list of strings	Order ID associated with the request.	n/a
`new_user`	boolean	If `yes`, indicates that the current user is new.	n/a
`groups`	list of strings	Custom groups or segments assigned to the user.	n/a
`custom`	custom object	Custom user context. Pass the name of the custom user context as the `key` (`string`) and the actual value as the `value` (`string`). You can pass more than one `key:value` pair. Example: RequestResponse `{"customID1": "value1", "customID2": "value2"}`	n/a

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