OK I am going to vent a little about situations like this. I do not know if exactly the same applies in Norway where you are, but this has been some of my experiences in the USA.
First of all you are dealing with a cheap company that makes a cheap product that they are not too proud of. Why else would they hire someone who is inexperienced to shoot photos of their product? Since they are cheap to start with, they will not want to pay you anything at all and in fact would rather you pay them for taking your stuff.
Here, we have what is known as a minimum wage law, which sets the bottom wage (usually measured in dollars/hour). People with skills get more than that per hour and one can measure that by looking at how many times the minimum wage is multiplyed i.e. 2 times or 4 times or 10 times etc. The minimum wage in my state is $7.93/hour and I usually charge about 25 to 30 times that (includes the use of the equipment). Assistants get about 10 to 15 times the minimum wage.
Then comes the matter of usage rights to the photographs you have taken. Unless I sign an agreement to the contrary, I would own the copyrights to any image that I have taken and the company would have to pay me for their usage. That agreement would specify where, how many times, what size etc that each image could be used by them. Fees would depend on all those factors. Or I might give them the opportunity to just buy the copyright from me and let them do whatever they want with them.
But no matter what you charge and however you decide to bill them for usage, all of this is agreed to and written down and signed before you ever walk in with your camera and start shooting. The first rule of commercial photography is:
GET IT IN WRITING BEFORE YOU DO ANYTHING!!!!!!
Sorry that this got so long, but you asked