Thanks heaps, I will have a look.
Yes, you’re right, I have purchased eStore but I just can’t get it activated… (I have not checked yet if there were any replies in that topic. I’m grateful for any help.)
Meanwhile I though I could use some other plugin for the time of my struggle 
), the plugin that would show a PayPal order button below cat postcards that I want to sell.
(Otherwise I think the ordering process that I had to offer to customers looks awkward to them. I had to say “tell me numbers of postcards you like, then I’ll send you an Invoice from Pay Pal, then you can pay”. I think I’m losing potential customers offering this way of ordering ) I just need to find something that will link to PayPal directly at least until everything is sorted out with eStore.)
Thanks a lot for your help. I will have a look at the link.
Cheers,
Natalie