to ATP Catrus! (saw that you're new here and thought I'd say hello!) We use 'Treemail' here for communicating individually. To access it you click the link in the upper right hand corner, then you'll click on "send a mail" which will be also in the right hand side. You will need Marks ATP name "a2b1c3"
Then you'll work it out with Mark how he wants payment.
Cheers