Guys, communication via email, phone and texts is normal.

In this case, I stock these Proj Mu brake pads most of the time or order them in stock when the stock runs low. No money is transacted until there is an exchange of goods/services.

Customers who come in for any goods and leave a deposit get an invoice/receipt printed out. In this case, I got the goods in before he paid for them as I usually keep these in stock. Printed receipt was also given for the purchase.