To verify that the request came from Constant Contact, compute the HMAC digest and compare it to the value in the x-ctct-hmac-sha256 header. If they match, you can be sure that the webhook was sent by Constant Contact and the message has not been compromised.

public bool IsValid()

public bool IsValid()

Public Function IsValid As Boolean

Public Function IsValid As Boolean

public:
bool IsValid()

public:
bool IsValid()

member IsValid : unit -> bool

member IsValid : unit -> bool