Your trading partner's certificate.
You must set your trading partner's certificate before processing any signed messages. This property should be set to a public key certificate.
If the trading partner's identity is unknown, you should first invoke ReadRequest and read the value of AS2To (or for AS3, AS3To). This will allow you to determine the correct certificate to use.
As a special case, you may set AcceptAnySignerCert to true. In this case, the component will attempt to validate the signature without knowing the certificate in advance. This is not recommended for production use, as it poses a security risk.
This property is not available at design time.