The decryption and receipt signing certificate.
public Certificate getCertificate(); public void setCertificate(Certificate certificate);
The digital certificate that the class will use to decrypt incoming transmissions and sign the MDN receipt (if requested). If a different certificate is required for decryption than for MDN signing, set the decryption certificate before calling ParseRequest, then set the signing certificate before calling CreateMDNReceipt. Certificate must be set to a private key certificate.