Can't find the Post-Editing Certification

I can't see and purchase the Post-Editing Certification on the products page: even though I clicked Purchase Exam in the previous certification page. Is it removed?

Also, I would like to ask. I had a certification titled RWS Post-Editing Certification but the certificate is a downloadable document and it is not displayed in the education page in The certificate I got can be found in Is this a different one. Can't I display it on the education page? Why is it a different site?

Sorry if my questions are stupid. I appreciate any help and clarification.