| 1 | <?php  | 
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| 23 | class Payone_Settings_Data_ConfigFile_PaymentMethod_PayolutionInvoicing  | 
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| 24 | extends Payone_Settings_Data_ConfigFile_PaymentMethod_Abstract  | 
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| 25 | implements Payone_Settings_Data_ConfigFile_Interface  | 
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| 26 | { | 
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| 27 | /** @var string */  | 
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| 28 | protected $key = Payone_Enum_ClearingType::PAYOLUTIONINVOICING;  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * @return string  | 
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| 32 | */  | 
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| 33 | public function getKey()  | 
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| 37 | |||
| 38 | public function getClearingType()  | 
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| 42 | }  | 
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| 43 | 
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.