Amend Rightmove request pre-send

gistfile1.txt

// Add lettings fees on property to RTDF feed
add_filter( 'ph_rtdf_send_request_data', 'add_property_lettings_fees_to_rtdf_feed', 10, 2 );
function add_property_lettings_fees_to_rtdf_feed( $request_data, $post_id )
{
    $property_lettings_fees = get_post_meta( $post_id, '_lettings_fees', TRUE );
    
    if ($property_lettings_fees != '')
    {
        $request_data['property']['price_information']['administration_fee'] = $property_lettings_fees;
    }
    
    return $request_data;
}