lib/custom/src/MShop/Service/Provider/Payment/OmniPay.php
public function checkConfigBE( array $attributes )
	{
		return array_merge( parent::checkConfigBE( $attributes ), $this->checkConfig( $this->beConfig, $attributes ) );
	}
public function checkConfigBE( array $attributes )
	{
		return array_merge( parent::checkConfigBE( $attributes ), $this->checkConfig( $this->beConfig, $attributes ) );
	}
Checks the backend configuration attributes for validity.

@param array $attributes Attributes added by the shop owner in the administraton interface
@return array An array with the attribute keys as key and an error message as values for all attributes that are
known by the provider but aren't valid