An execution setting
validate_only
: when this option is specified, the API call will not perform the mutation but will run through the validation rules against values of each field.
If the call passes validation or review, response will be {"success": true}
. If the call does not pass, an error will be returned with more details. These options can be used to improve any UI to display errors to the user much sooner, e.g. as soon as a new value is typed into any field corresponding to this ad object, rather than at the upload/save stage, or after review.