put https://{base_url}/core/api/v1/locations/country/
This endpoint updates a Country by Country name. Using this only alias can be updated. Please note that it doesn't do the bulk update. For example, if you enter country and city then it will not update alias for all the zip codes of that city. But it will update alias for the record which has country and city same as mentioned in input but doesn't have district, state and zip code. If you want to update in bulk then please use "Upload Country Info in Bulk" API.