Delete a custom data column from campaign contacts

Removes a custom column from all contacts in a campaign's call queue. The column is deleted from the social_data field of every contact's json_csv_infos. The column name must exist in social_data — built-in fields (firstname, lastname, company) cannot be deleted. This operation is logged in the campaign's audit log (see GET .../logs).

Permission: No specific permission required. A valid API key is sufficient.