To stop someone from sending the exact same old webhook notification again to trick an application, what security measure should the webhook receiver use?

To prevent an application from being tricked by someone re-sending an exact copy of an old, legitimate webhook notification, which is a specific type of attack called a replay attack, the webhook receiver must implement mechanisms that ensure each unique message is processed only once. The core security measures involve combining unique message identifiers with time-based validation and cryptographic integrity checks.The primary measure against replay attacks is to include a unique identifier, commonly referred to as a nonce, within the webhook payload. A nonce is a value, such as a random string or a monotonically increasing counter, that is generated by the sender for each individual webhook notification and is intended to be used only once. When the webhook sender dispatches a notification, it embeds a newly generated, unique nonce into the message. Upon receiving a webhook, the receiver first extracts this nonce. It then consults an internal record, typically a database or a high-speed cache, to determine if this specific nonce has been previously encountered and processed. If the nonce is found in the receiver's records, it signifies a replay attempt, and the receiver should immediately reject the notification without further process....