diff --git a/docs/api/plugins/payment.md b/docs/api/plugins/payment.md
index 5138befe3454f376692a87dcc756d29544262139..a5e85297df3a546a08d441e5c367e4e9b07e995d 100644
--- a/docs/api/plugins/payment.md
+++ b/docs/api/plugins/payment.md
@@ -441,7 +441,7 @@ uni.requestPayment({
 
           // 请求苹果支付
           const transaction = await this._iap.requestPayment({
-            productId: this.productId,
+            productid: this.productId,
             // username: username + orderId //根据业务需求透传参数，关联用户和订单关系
           });