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All customer-owned digital certificates have an expiration date relative to the date of purchase. I&RS requires all web services clients to notify Insurance Support by email at This email address is being protected from spambots. You need JavaScript enabled to view it. in preparation of an expiring, changing, or scheduled updated digital certificate. DTCC requests that you notify Insurance Support at least 4 weeks in advance of the certificate expiration date or digital certificate change date. Send the entire certificate chain at runtime to perform a preliminary test before contacting DTCC to update the digital certificate.