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POST
Events the device sent before this call are attributed to the user as well.

Body

object
required
The device to link.
string
required
Your own stable user id, at most 256 characters.
object
Values to merge onto the user. Keys you send are set, keys you leave out are unchanged, and a null value removes the key. Values are strings, numbers, booleans or null, and keep their type.Limits: 64 keys per user, keys up to 128 characters, string values up to 1,024 characters, 32 KB in total.

Response

string
Our id for this user.
number
How many of the device’s earlier events were attributed to the user.