Payment Gateway

Here are some well known payment gateways available in the market with detailed development and integration guides,

• http://www.abcpayments.com
  
• http://www.ebs.in
• http://www.ccavenue.com
• http://www.authorize.net
• https://www.paypal.com
• http://www.paypoint.net

This link may help you in choosing right payment gateway as per your requirements.