Get user first name from custom endpoint

If you look at the documentation, first_name is not in the list of accepted values for the fields parameter, and if you enabled debugging, you’d see adding first_name to that parameter would actually cause a database error — Unknown column 'wp_users.first_name' in 'field list'. And the same goes to the “firstname” and any other non-standard values.

So as the documentation says, “You must create a second query to get the user meta fields by ID or use the __get PHP magic method to get the values of these fields.“, you would need to manually add the first_name item to your $members array like so:

// &$member means we're modifying the original $members array
foreach ( $members as &$member ) {
    $member->first_name = get_user_meta( $member->ID, 'first_name', true );
}

But make sure ID is in the field list, e.g. $user_fields = array( 'user_nicename', 'user_url', 'ID' );.

And as for controlling the number of results, check the pagination parameters like number:

// Get at most 10 users (per page).
$user_query = new WP_User_Query( array( 'number' => 10 ) );

And BTW, remember to set permission_callback for your custom REST API endpoint.

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