the service provider is required to essentially do three things.
1. Change a form into tabs in AJAX. while doing that he/she need to introduce some of the cart parameter for user input.
2. Integrate it with existing wordpress template shopping module thus taking input from above form.
3. Modify the jigoshop to offer optional ccavenue payment gateway.
the project is on urgent basis and the service provider should be able to give enough attention to this project. also it it expected that he/she should have prior experience with integrating shopping carts with wordpress.