Couldn't find any TODO comments in your previous commits.
actually that part was:
"payid" => $_REQUEST['payid'],
"receiver" => $this -> receiver_id,
"amount" => "0",
"currency" => "0"
Which is mentioned in @roelandp post and can be found on github.
It not looks like your Dev file.
yup. actually, also the url https vs. http is different. Steve said he had (yet) another folder which he developed in, so that explains why.... So a third folder with a copy of the plugin.