Mastery of Customer Experience with Professional Certification Learners completed the CX500 Series or PX500 Series of Online Courses independently. Learners passed the online Certification Exam. Learners were awarded the CXSTM or PXSTM certificates to elevate their professional standing, the standards of excellence in their organization, and bring fullness to the CX and PX disciplines. Here is the list of Our Customer Experience Specialists, Earn your Certification as a Customer Experience Specialist. Contact us now.