from prmia.org candidate guide:
Please note that all vouchers used to schedule exams have an expiration date. Should you
attempt to schedule or reschedule to a date beyond the expiration date of your voucher, it
will not be accepted by Pearson VUE. You may contact support@prmia.org for a new
voucher number, which will be provided to you without charge, subject to the condition
that the request is made within one year of the expiration date. After one year has passed
since the expiration date of the voucher, no replacements will be made.

tears , tears！   多谢老兄了！

PRM Vouchers will now have a validity of 3 years.  Candidates will have 2 years to complete the PRM Program from the first successful attempt at any of the PRM Exams.  In the eventuality of an unsuccessful examination attempt, candidates can purchase additional PRM Vouchers online or by contacting support@prmia.org.

http://www.prmia.org/news/prmia- ... nt-prm-exam-changes