> ## Documentation Index
> Fetch the complete documentation index at: https://docs.paypal.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Duplicate transactions

Returns from the Payments V2 API.

`DUPLICATE_TRANSACTION` indicates that a transaction with identical details has already been processed, and has been flagged to prevent duplicate charges.

| Cause                                                                                                                                                                                                                                                                                                                                                                                               | Impact                                                                                                                                                                                               | Resolution                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| - Network latency or delays: Issues in network or server communication could result in a resending of the transaction request. <br /> - Payer actions: A payer might inadvertently submit the payment information multiple times, such as by clicking the payment button more than once. <br /> - Server error: The client-side application did not receive a response and retried the transaction. | - Customer dissatisfaction: Needing to perform additional steps to confirm the transaction status, or being unsure whether the transaction succeeded, can lead to customer confusion or frustration. | - Check transaction status: Verify whether the original transaction succeeded by checking the transaction history in your PayPal account or through the API. <br /> - Implement idempotency: Use unique identifiers, such as an idempotency key, for each transaction request to ensure that retries do not result in duplicate transactions. <br /> - Improve user feedback: Provide clear feedback to payers about their transaction status to prevent them from resubmitting the payment. <br /> - Implement error handling: Implement error handling and network retry logic to manage connectivity issues without resubmitting identical requests. |