Merchant-Inititated Reversals {#pd-feature-mit-reversal-intro}
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When you do not receive a response message after sending a PIN debit purchase or credit request, your request might have timed out. This feature enables you to reverse a timed-out transaction within 2 hours of the original request.  
When using the merchant-initiated reversals feature, include the clientReferenceInformation.transactionId field in your original request for a PIN debit purchase. The value of the transaction ID must be unique for 60 days. It links your reversal request to your original request.