Add a new column to an existing custom table; the new column is appended after the table's current columns. Requires the acting user to be an owner-admin. To create a table together with its initial columns, use Create Custom Table (create-public-custom-table) instead. To edit an existing column or replace the table's full column set, use Update Custom Table (update-public-custom-table) instead. For a single standalone field not backed by a table, use Custom Fields > Create Custom Field (create-public-custom-field) instead.

OAuth Scopes: employee:custom_fields.write