public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder->add('amount', MoneyType::class, ['label' => 'sylius.form.shipping_calculator.per_unit_rate_configuration.amount', 'constraints' => [new NotBlank(['groups' => ['sylius']]), new Type(['type' => 'integer', 'groups' => ['sylius']])], 'currency' => $options['currency']]);
}