Optional, only if you want us to follow up with you. It can be hard to buy large amounts of bitcoins with cash, especially with cash deposit. Learn more about how we make money from our partners. At the store you present the code to the cashier and pay for the amount of coins you want. We do research on every exchange we list and are very careful not to include scam exchanges on our site. Disclaimer: Buy Bitcoin Worldwide is not offering, promoting, or encouraging the purchase, sale, or trade of any security or commodity.