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Square is a leading FinTech API provider that offers a comprehensive payment gateway solution for businesses. It allows merchants to process payments efficiently and securely, providing a seamless checkout experience for customers. Square's APIs are designed to handle various payment methods, including credit cards, digital wallets, and more.
When integrating Square's payment gateway, you might encounter the DUPLICATE_TRANSACTION error. This error typically manifests as a failed transaction attempt, where the system indicates that the transaction has already been processed.
The DUPLICATE_TRANSACTION error occurs when a transaction with the same details is attempted more than once. This can happen due to network issues, user error, or system glitches that cause the transaction request to be sent multiple times.
The primary cause of this error is the repeated submission of identical transaction data. This can be due to:
To resolve this issue, follow these actionable steps:
Before proceeding with any fixes, check the transaction history in your Square Dashboard to confirm if the transaction was indeed processed. You can access the dashboard here.
Use idempotency keys in your API requests to ensure that duplicate transactions are not processed. An idempotency key is a unique identifier for each transaction request. If a request with the same key is received, Square will recognize it as a duplicate and prevent it from being processed again. Learn more about idempotency keys here.
Ensure your application is designed to handle network timeouts gracefully. Implement retry logic with exponential backoff to prevent immediate resubmission of requests.
Provide clear instructions to users to avoid refreshing the payment page or clicking the payment button multiple times.
By understanding and addressing the root causes of the DUPLICATE_TRANSACTION error, you can ensure a smoother payment processing experience for your customers. Implementing idempotency keys and handling network issues effectively are key strategies in preventing this error. For more detailed guidance, refer to Square's official documentation.
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