Defective Goods / Order not Received If a customer hasn't yet received the item they've purchased online, they can initiate a payment dispute. That's why it's always advised to keep a track of the goods that have been shipped from your end. Businesses should also keep the shipping receipts with them so that they are well prepared to handle such situations to avoid disputes.
Customer Denies the Charges In most instances, customers refuse from their statement that they've made transactions over mail or phone. That's why if you've received an order from the Customer via phone or email, then ask the Customer to give you more information. For example- ask customers to provide you with their home address and credit card's CVV details.
Invalid Credit Card To handle these kinds of situations, you'll first have to install a robust system. It'll help you identify expired or invalid cards, and automatically, the system will reject the payments made through them. If the card has never been used or isn't a valid credit card number and your system fails to identify it, you'll have to encounter a chargeback problem.
Other Technical Problems Duplicate processing - It happens because of system errors. The customer purchased a single product, but the credit card being charged two times for the single product. This makes chargebacks on credit cards a usual thing. Duplicate charge - When a customer presses the "PAY" button two times by mistake. Human error - Accountant mistakes can also lead to this issue. That's why one should completely avoid manual processing.