In Form Builder, how to listen for input from forms?

class Add extends Component  implements HasForms, HasActions
{
    use InteractsWithActions;
    use InteractsWithForms;

    public OrderModel $order;
    public $productsData;

    public function render()
    {
        return view('livewire.company.order.add');
    }

    public function addOrderAction(): Action
    {
        return Action::make('addOrder')
            ->form([
                Textarea::make('notes')
                    ->rows(3),
                Builder::make('paybacks')
                    ->blocks([
                        Builder\Block::make('heading')
                            ->schema([
                                TextInput::make('amount')->numeric()->required(),
                                Select::make('status')
                                    ->options([
                                        'pending' => 'pending',
                                        'completed' => 'completed',
                                    ])->native(false)->required(),
                            ])->columns(3),
                        // ...
                    ]),
                FileUpload::make('contract')->multiple(),
            ])
            ->action(function (array $data, OrderModel $record): void {

            })
            ->mutateFormDataUsing(function (array $data): array {

            });
    }
}