Invoices now specify when they're finalized alongside other status transitionsBreaking changes

What’s new

Moves the finalized_at property for invoices into the status_transitions hash.

Impact

This change moves the finalized_at property for invoices into the new status_transitions hash. You now need to access the finalization timestamp through status_transitions.finalized_at instead of directly from the Invoice object. This modification organizes invoice status change information more coherently.

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