Config.php

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<?php
namespace Magento\Payment\Gateway\Config;

use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Payment\Gateway\ConfigInterface;
use Magento\Store\Model\ScopeInterface;

class Config implements ConfigInterface
{
    const DEFAULT_PATH_PATTERN = 'payment/%s/%s';

    private $scopeConfig;

    private $methodCode;

    private $pathPattern;

    public function __construct(
        ScopeConfigInterface $scopeConfig,
        $methodCode = null,
        $pathPattern = self::DEFAULT_PATH_PATTERN
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->methodCode = $methodCode;
        $this->pathPattern = $pathPattern;
    }

    public function setMethodCode($methodCode)
    {
        $this->methodCode = $methodCode;
    }

    public function setPathPattern($pathPattern)
    {
        $this->pathPattern = $pathPattern;
    }

    public function getValue($field, $storeId = null)
    {
        if ($this->methodCode === null || $this->pathPattern === null) {
            return null;
        }

        return $this->scopeConfig->getValue(
            sprintf($this->pathPattern, $this->methodCode, $field),
            ScopeInterface::SCOPE_STORE,
            $storeId
        );
    }
}