Using a Central Exchange Rate for Shopkeeper Pricing

If a store prices products in one currency but sells in another, the exchange rate should live in one central place, not inside every product.

When a catalog contains hundreds or thousands of products, manually updating converted prices is not sustainable. The cleaner approach is to keep a single exchange-rate value and calculate the final sale price at output time or during cart preparation.

Practical pattern

store the base price in the product data
keep the exchange rate in one system setting, TV, or helper table
multiply the displayed and cart price through a shared pricing helper

This keeps pricing consistent across listings, product pages, and checkout, while making daily or weekly rate changes manageable.

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