put
https://{region}-api-freshrelevance.dotdigital.com/api//custom_data_tables/table/
Updates basic information and the fields associated with a specific Custom data table.
When updating fields, this is a complete state transfer, so you must include all fields in this request.
Any new fields included are created. Any existing fields not included are deleted.
Fields are matched on fieldId. If you don't include any of name, archived, or fields in the request then they won't be updated.