Where to store SHOP_DOMAIN and API_KEY

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When the SHOP_DOMAIN and API_KEY are stored in the shop.properties file they are not resolved. This is the sample code:

   String shopUrl = BuildConfig.SHOP_DOMAIN;
    if (TextUtils.isEmpty(shopUrl)) {
      throw new IllegalArgumentException(SHOP_PROPERTIES_INSTRUCTION + "You must add 'SHOP_DOMAIN' entry in "
          + "app/shop.properties, in the form '<myshop>.myshopify.com'");
    }

    String shopifyApiKey = BuildConfig.API_KEY;
    if (TextUtils.isEmpty(shopifyApiKey)) {
      throw new IllegalArgumentException(SHOP_PROPERTIES_INSTRUCTION + "You must populate the 'API_KEY' entry in "
          + "app/shop.properties");
    }

These are the errors:

cannot find symbol variable SHOP_DOMAIN
cannot find symbol variable API_KEY
cannot find symbol variable OKHTTP_LOG_LEVEL
cannot find symbol variable SHOP_DOMAIN
cannot find symbol variable API_KEY
cannot find symbol variable DEFAULT_LOCALE

I've imported the import com.shopify.buy3.BuildConfig; This class doesn't provide these variables.

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Do not import tthat class.