如何执行Ajax表单提交和CCAvenue条件。

I have a form in index.php which uses jQuery Ajax to send data to another php file [updateEntries.php] and then the values are entered into database there. However If paid checkbox is checked.. I need call and ajax request and redirect it to the CCAvenueRequestHandler.php with the variables like amount, merchant_id etc.

I have tried the following:

1. Double ajax request
2. Redirect to CCAvenueRequestHandler.php in ajax success function.
3. Redirect it to a page where merchant_id and all the details are filled with amout in GET parameter.[This works a bit however I need to skip this step as it will be extra burden on the customer]