Update an opportunity

*status_id* - See description for `status_id` in `POST /opportunity/` above. - Setting the `status_id` to a status with a type of `won` will automatically set the `date_won` field if it is not already set or provided in the request. Reverting it from a `won` status to an `active` or `lost` will not automatically change `date_won`. *date_won* (optional): - If not set on the resource or in the request, the `date_won` will be set automatically to today's date when setting `status_id` to a status with type `won`. The `x-tz-offset` header, used to pass your timezone's UTC offset, will be taken into account. *custom.FIELD_ID* (optional) - See description for `custom.FIELD_ID` in `POST /opportunity/` above. - Additionally, you can unset a single field by using `{ "custom.FIELD_ID": null }`, e.g.: ``` { "custom.cf_v6S011I6MqcbVvB2FA5Nk8dr5MkL8sWuCiG8cUleO9c": null } ``` If you're trying to update a custom field and that custom field accepts multiple values, you can also specify `.add` or `.remove` as part of the field key to add/remove a single value to/from a list of values, e.g.: ``` { "custom.cf_v6S011I6MqcbVvB2FA5Nk8dr5MkL8sWuCiG8cUleO9c.add": "Wednesday" } ```