ONE of South Africa's largest grocery retailers Pick n Pay is expanding a pilot of adding cryptocurrency as a payment option to more stores after the successful completion of the first phase, it said on Tuesday. The announcement came weeks after the Financial Sector Conduct Authority formally declared crypto assets as a financial product in South Africa, enabling them to be regulated and clearing the way for cryptocurrency to be a mainstream method of payment. "Increasingly cryptocurrency is being used by those under-served by traditional banking systems, or by those wanting to pay and exchange money in a cheaper and…