class Attio::Util::WebhookSignature

def calculate_signature(payload, timestamp, secret)
  # Ensure payload is a string
  payload_string = payload.is_a?(String) ? payload : JSON.generate(payload)
  # Create the signed payload
  signed_payload = "#{timestamp}.#{payload_string}"
  # Calculate HMAC
  hmac = OpenSSL::HMAC.hexdigest("SHA256", secret, signed_payload)
  # Return in the format Attio uses
  "v1=#{hmac}"
end