trying to change the amount on the payment form with quantity chosen 8 amount- using SIM API

[sharedvision1]

Hello,

I am using the SIM API

I need  to have have a quanity field in my product listing.

and I am looking to have the payment form update according to the correct total ( being - quanity*amount).

How would I go about doing this. Is there an example of this anywhere?

Thanks.

-Ann

[Trevor]

When using the Authorize.Net hosted payment form, the final payment amount must be determined prior to generating the form.  Any kind of interface like you are describing would need to be handled on your own web site prior to any communication with the Authorize.Net API.