Before you can make any purchases using your cashback, it must first be displayed as available in your Cashback Sock. After that, you can transfer this money to your personal bank account. From there, you can use it via any common payment method.
Please also take into consideration that your cashback can be donated to a good cause, or you can transfer it to your Savings Sock where Shopbuddies will top it up by 3% every year! You can even do all three at once.