user_id of the secondary user account being linked.
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "$id": "#/components/schemas/UserId", "title": "UserId", "description": "user_id of the secondary user account being linked.", "oneOf": [ { "type": "string", "default": "abc", "minLength": 1 }, { "type": "integer", "default": 191919191 } ] }