Set up multi-currency pricing

Before I roll out multi-currency pricing, make it easy for buyers and accounting. Show the local price, the equivalent in our accounting currency, and where FX margins apply. Flag SKUs that lack localized prices, call out applicable VAT or sales tax rules for each market, and surface how refunds will be handled across currencies. Highlight any places a reviewer will hesitate to approve.

I just added EUR prices and several EU customers are disputing the charged amounts, claiming the conversion shown at checkout didn't match their statement. I don't know whether the problem is rounding, FX timing, or how refunds were processed. Customers are escalating to support leads in Berlin. What is the most likely root cause and the fastest way to verify and fix affected transactions?

We keep losing customers and getting disputes when launching new currencies because pricing, tax treatment, and refund flows are inconsistent across markets. Looking across past launches into three currencies, where do we repeatedly trip up, and what two operational habits should we change so new currency launches don't generate disputes or extra support load? Specify the exact checks to perform before launch.