Implementing cybersource using Ajax

Question

Hi All,

I am using cybersource as the payment gateway for my application. The payment information is sent correctly if we post the form without using an Ajax request.

Now we need to implement this by using an Ajax request. I tried passing the information to cybersource but got a javascript error "access denied" when I tried to submit the form using Ajax post request.

When I tried to debug this issue the line "mypostrequest.open("POST", "theUrl", true);" was giving the error.

Is there any reason why a site might block a post request through Ajax and not block a request from the usual form post ?

Thanks in advance.