Simulate transaction or payment (v2)

Creates an enhanced v2 transaction simulation that calculates and previews all costs, exchange rates, and requirements before executing a transaction. The v2 version provides more detailed breakdowns including itemized fees (network fees, service fees, FX fees), step-by-step multi-currency conversion paths for complex transactions, compliance requirements based on amount and destination, and improved exchange rate accuracy. Simulations are valid for 24 hours and should be used to show users exact costs before they confirm a transaction. Use v2 for better transparency and accuracy, especially for cross-border or multi-hop currency conversions.