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I think you made a mistake by starting a new curl session for each request.

I suggest a single init then for each step, do the exec.

I tend to remember also that postfields is an array not the query string.

I also remember that the curl api in php has difficulties with cookie. I usually address that thru a header callback function.

This is one of the comment I have on one of my code intensively using curl

   // cUrl is the dumbiest smartest piece of code. Header get completly
   // useless while using CURLOPT_FOLLOWLOCATION or CURLOPT_COOKIEFILE or CURLOPT_AUTOREFERER
   // information get pruned off the header most of the time (worst it is implemenation/version
   // dependent). Let's handle that manually

It seems, your problem is cUrl specific, nothing to do with Prestashop

Best,

(d)oekia