There are some simple steps you can take to prevent your customers from disputing transactions:
Make sure you use the description field correctly for every item charged. This will appear on customer receipts.
Keep your customers informed about your company's return policy and post relevant information on your website.
Provide as much accurate information as possible about the delivery procedures for your products or services.
Make a contact phone number available for customers to contact you on.
Ensure that you keep as complete a record as possible of transactions.