How to pass additional POST parameters to export server request ?

Hello,
 
Thank you for reaching out to us.
 
In order to complement the request generated by Flexmonster, the following approach can be used.
Specify the destinationType parameter of the exportTo API call with the following value: "plain". In such a case, the component’s content will be returned with callbackHandler of the exportTo method. Next, the desired POST request can be composed and sent to the server with returned data.
 
Please see the following code snippet for the reference:

flexmonster.exportTo("pdf", { destinationType: "plain" }, function(result) {
  //sending POST request with a received data
}); 

Detailed information about the exportTo API call can be found in our documentation.
 
Please let us know whether the described approach works for your case.
 
Regards,
Illia