| List additional codes | GET | /settings/additional_codes | Returns a page of additional codes under data, with paging details under pagination. |
| Create an additional code | POST | /settings/additional_codes | Creates an additional code and returns it under additional_code. |
| Retrieve an additional code | GET | /settings/additional_codes/{additional_code_id} | Returns one additional code by its id, under additional_code. |
| Delete an additional code | DELETE | /settings/additional_codes/{additional_code_id} | Deletes an additional code. The response has no body. |
| Update an additional code | PATCH | /settings/additional_codes/{additional_code_id} | Changes the fields or the status of an additional code. |