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使用 Go SDK 验证传入的 UQPAY Webhook 签名。
webhook.NewVerifier，然后把未经修改的payload和UQPAY签名headers传给ConstructEvent。
实现签名验证前，请先配置通知URL，并了解Webhook投递与安全机制。
import "github.com/uqpay/uqpay-sdk-go/webhook"
verifier := webhook.NewVerifier(webhookSecret)
event, err := verifier.ConstructEvent(
rawPayload,
request.Header.Get("x-wk-signature"),
request.Header.Get("x-wk-timestamp"),
)
if err != nil {
http.Error(writer, "invalid webhook", http.StatusBadRequest)
return
}
HMAC-SHA512(secret, rawPayload + timestamp)、拒绝超出默认5分钟防重放窗口的时间戳，并解析通用事件envelope。