I tried to test out WordPress REST API by deleting a user (using basic authentication just to see if everything works), but no matter how I try to pass the parameters to the destination server, I always get rest_missing_callback_param.

Here is a screenshot from POSTMAN:

Authentication is correct. Parameters set.

It happens even when I tried with PHP:

$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL,"http://web.com/wp-json/wp/v2/users/3" );
curl_setopt( $ch, CURLOPT_CUSTOMREQUEST, "DELETE" );
curl_setopt( $ch, CURLOPT_HTTPHEADER, 

    array( 'Authorization: Bearer ' .$authToken )


curl_setopt( $ch, CURLOPT_POSTFIELDS, $http_query );
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
$output = curl_exec( $ch );
curl_close( $ch );

What could possibly be a problem here?

Thank you.

1 Answer 1


You need to deliver another argument - the reassign.

"Reassign the deleted user's posts and links to this user ID." - WP API documentation

Please try like this:

DELETE http://web.com/wp-json/wp/v2/users/3?reassign=NEW_USER_ID
  • You might also need to pass force=true, so the url would look like this: http://web.com/wp-json/wp/v2/users/<id>?reassign=<id>&force=true Commented Aug 6, 2019 at 15:39

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