A Promise with user info data. When successful, the accessToken in userIdentity
will be updated.
{
"uuid": "c7e9fed4-bedf-428b-a694-1bbd21721cf7",
"accessToken": "c7e9fed4bedf428b.a6941bbd21721cf7..."
}
See documentation for corresponding error codes:
https://redirector.arcpublishing.com/alc/docs/swagger/?url=./arc-products/arc-identity-v1.json#/Authentication/authToken