image created, but i dont find the image

hi,

i was in search of making screenshots from a given url and found finally this api. I join to this website ->

plsein.tk/site/products/products

and got my code / key to connecting the api. This works fine, i think, because of the response "image was created", but i dont find the image on my server. I believe there is a problem with the img_path i given. It is an absolut-path and looks something like that ->

$img_path = 'http://www.example.com/media/screenshots/'.$id.'.png';