I met the co-founder of inPDV in TechCrunch Disrupt in SFO. He claims that 2.5 billion people in Brazil don't have access to credit/ debit cards. Consequently, they can't buy anything online.

inPDV is offering a new mechanism using which people can pay online using cash. All that they have to do is select cash in the drop down list of payment methods. These payment accounts are connected to the user's mobile phone numbers. Reloading the balance is also easy.