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Pending transactions appear in your register. They are separated from other transactions by a solid green line and displayed with a different shade of color than standard transactions so you can easily identify them. They also display an hourglass icon in the Status column.
How does 
What happens when a pending transaction clears?
When a pending transaction is no longer pending, it will either be listed as a regular transaction (if the transaction clears) or will disappear if the pending transaction is removed but no charge occurs.