Firstly, it's important to understand that canceling a pending debit card transaction generally must involve the merchant, as banks often do not have the option to cancel such transactions on their end. Here's how to proceed with how to cancel a pending transaction on a debit card: 1. Contact the merchant and request that they cancel the transaction. Provide them with necessary details such as the transaction amount, date, and any additional information they might need. 2. If the merchant is unreachable or unwilling to cancel the transaction, reach out to the bank. They might have a solution, although it's less common. 3. Maintain regular checkups on your bank account and if the transaction goes through despite your efforts, you can dispute it with your bank. Remember, cancellation policies vary by bank and by merchant. Always familiarize yourself with these policies to avoid future inconveniences.