Following Mastercard’s (MA)  Q2 report on Wednesday, we now have the most recent financial insight into the major credit card companies with Visa (V)  reporting its quarterly results last week.Let’s see how these payment service leaders are faring in the current economic environment and if it's time to buy Visa or Mastercard stock.  Visa’s Q3 Results Last Tuesday, Visa reported results for what was its fiscal third quarter stating its key business drivers were relatively stable as payments volume increased ...