Payment can be done by payment gateway

1
Online payment
A short review of online payment

• That requirement is a much tougher standard than
  being chosen by a group of executives. It's also
  a standard that encourages tech people to be good
  members of the tech community.
• It acts to reinforce good behavior on everyone's
  part. In this way, Google appeals to the hacker
  mindset these are the technology fanatics the
  company wants to recruit.
• The assumption is that geeks are not rewarded by
  giving them managerial titles. Yes, monetary
  rewards are important, but nonfinancial types of
  compensation are at least as important.