where is the api call made?

Hey guys, im trying to find out where the api call is made to paypal for express check out.

i would like to make some changes to it but can't seem to figure out what page actualy makes the call. does any one know?

thanks in advance

What sort of changes?

basicly i want to see what string its sending out, i was told by paypal that you could ec only works if the user has a pp account. but zencart has it setup in a way that u don't need an account.

i want to see how the script is settup so i can change another site i programed from scratch

The details on PayPal Express Checkout integration can be read here:
https://www.paypal.com/IntegrationCenter/ic_api-reference.html
https://www.paypal.com/IntegrationCenter/ic_nvp.html

LOL, well i tried asking paypal how to do this for about two months now and they had nothing. i looked on their wesites called their teck support. untill i showed them that it was able to be done on my zencart, they said it wasn't possible. now they are saying if i can send them the page with the api call they can tell me what nvp is doing it.
do any of you know.

i think its the same page that

function ec_step1() is defined

but not sure.

sometimes the way zen cart is programed is a little above my knowalge

any one think they know?

does no one know what .php file has the api call to paypal for express checkout