Root Cause

• Session timeout: The customer took too long to complete the payment, and the transaction session expired.
• Authorization expiry: The authorization token or payment intent was not used within the allowed timeframe.
• Inactivity during checkout: The user navigated away or remained idle too long before submitting payment.
• Delayed response from the gateway: External delays caused the transaction to fall outside the valid processing window.

Troubleshooting and Solutions

• Inform the customer that their transaction session has timed out.
• Ask the customer to reinitiate the payment process from the beginning.
• Ask the customer to complete the checkout process without delays to avoid a timeout.
• Review timeout settings for transaction sessions and payment intents.
• Consider extending the session duration if timeouts are frequent.