src/models/ShopProduct.php
public function getBaseProductPriceCurrency()
    {
        if ($this->_baseProductPriceCurrency) {
            return $this->_baseProductPriceCurrency;
        } else {
            $this->_baseProductPriceCurrency = $this->baseProductPrice ? $this->baseProductPrice->currency_code : \Yii::$app->money->currencyCode;
        }

        return $this->_baseProductPriceCurrency;
    }
public function getBaseProductPriceCurrency()
    {
        if ($this->_baseProductPriceCurrency) {
            return $this->_baseProductPriceCurrency;
        } else {
            $this->_baseProductPriceCurrency = $this->baseProductPrice ? $this->baseProductPrice->currency_code : \Yii::$app->money->currencyCode;
        }

        return $this->_baseProductPriceCurrency;
    }
Валюта базовой цены

@return string