Call to an undefined method Sylius\Component\Payment\Model\PaymentMethodInterface::getGatewayConfig().

Parameter #2 $factory (Sylius\Component\Resource\Factory\FactoryInterface) of method Sylius\PayPalPlugin\Factory\PayPalPaymentMethodNewResourceFactory::create() is not contravariant with parameter #2 $factory (Sylius\Resource\Factory\FactoryInterface) of method Sylius\Bundle\ResourceBundle\Controller\NewResourceFactoryInterface::create().

Method Sylius\PayPalPlugin\Factory\PayPalPaymentMethodNewResourceFactory::create() should return Sylius\Component\Resource\Model\ResourceInterface but returns Sylius\Resource\Model\ResourceInterface.