During the PMP audit process, you have to submit the essential documents within 90 days. The PMI audit materials have to be enveloped and sent to the address (PMI, Attn: Certification Audit, 14, Campus Blvd, Newtown Square, PA 197033299, USA). PMI does not accept email and faxed audit documents, and participants are advised to send all necessary documents together in one envelope to ensure a prompt processing time.