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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                declare(strict_types=1);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace LauLamanApps\eCurring\Resource\Proxy;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use DateTimeImmutable;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\eCurringClientInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\Resource\Customer;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\Resource\Customer\Gender;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\Resource\Customer\VerificationMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\Resource\CustomerInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use LauLamanApps\eCurring\Resource\Transaction\PaymentMethod;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method int getId()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method Gender getGender()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getFirstName()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string|null getMiddleName()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getLastName()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getCompanyName()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getVatNumber()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method PaymentMethod getPaymentType()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method VerificationMethod|null getBankVerificationMethod()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getCardHolder()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getCardNumber()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getPostalcode()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getHouseNumber()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string|null getHouseNumberAdd()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getStreet()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getCity()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getCountryCode()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getLanguage()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getEmail()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method string getTelephone()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method array getSubscriptions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method DateTimeImmutable getCreatedAt()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @method DateTimeImmutable getUpdatedAt()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class CustomerProxy extends AbstractProxy implements CustomerInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return Customer  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function __load(eCurringClientInterface $client, string $id)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $client->getCustomer($id);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In the issue above, the returned value is violating the contract defined by the mentioned interface.
Let's take a look at an example: