Update invoice

{{$id}}

{{$invoice_date}}

{{$reference}}

{{$project_name}}

{{$company_name}}

{{$company_details}}

{{$recipient_details}}

{{$description}}

{{$footer}}

{{$show_hours_worked}}

{{$show_full_report}}

{{$show_user_summaries}}

{{$show_project_summaries}}

{{$show_project_name_for_expenses}}

{{$calculation_method}}

{{$flat_rate}}

{{$standard_hourly_rate}}

{{$custom_user_id_1}}

{{$custom_hourly_rate_1}}

{{$custom_user_id_2}}

{{$custom_hourly_rate_2}}

{{$custom_title}}

{{$custom_date_label}}

{{$custom_project_label}}

{{$custom_reference_label}}

{{$custom_total_due_label}}

{{$currency_code}}

{{$currency_symbol}}