feat: refactor webhook handling for ViettelFFM partner API

- Add structs `Webhook`, `WebhookData` to handle webhook data in ViettelFFM partner API

Signed-off-by: Sinh <luuvansinh555@gmail.com>

partnerapi/viettelffm/model.go

@@ -64,3 +64,16 @@ type ORResult struct {
 	OrId   int    `json:"or_id"`
 	Status string `json:"status"`
 }
+
+type Webhook struct {
+	Data WebhookData `json:"data"`
+}
+
+type WebhookData struct {
+	OrId          int     `json:"or_id"`
+	OrCode        string  `json:"or_code"`
+	PartnerOrCode string  `json:"partner_or_code"`
+	Status        string  `json:"status"`
+	TotalPrice    float64 `json:"total_price"`
+	ShippingFee   int     `json:"shipping_fee"`
+}