To which level does it belong: application or domain?

Where should I put this?

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, « ». PurchaseEbookController



, , PurchaseEbook



, PurchaseEbookService



. , . Purchase



PurchaseRepository



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-- ApplicationInterface?

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namespace Application;

interface ApplicationInterface
{
    public function purchaseEbook(PurchaseEbook $command): void;

    /**
     * @return EbookForList[]
     */    
    public function listAvailableEbooks(): array;
}
      
      

        
        
        
      

    
        
        
        
      
      

        
        
        
      

    
    

, listAvailableEbooks()



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PHP-? — .

Middle+ , PHP.



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