put
https://{youraccountname}.api-us1.com/api/3/customObjects/schemas/
Make an update to a given schema.
To delete a schema field, reference the field delete endpoint: https://developers.activecampaign.com/reference/delete-a-field-1
Users are encouraged to leverage the ?showFields=all query parameter when programmatically creating new schema fields, to ensure field id uniqueness. Fields that have been deleted will contain a status: marked_for_deletion attribute.