paypal支付app调用只是拉起paypal网页登录，登录成功之后跳回app也没有触发success，点取消返回app也没反应，只有切后台直接回app才会触发fail

uni.requestPayment({
provider: "paypal",
orderInfo,
success: async function (res : any) {
console.log("[Payment Flow] ✅ PayPal authorization SUCCESS:", JSON.stringify(res));
try {
const rawdata = JSON.parse(res.rawdata);
console.log("[Payment Flow] Authorized orderId:", rawdata.orderId);
} catch (e) {
console.log("[Payment Flow] rawdata parse info:", res.rawdata);
}

                        // 授权成功后，调用后端 capture 接口完成扣款  
                        uni.showLoading({ title: "Processing...", mask: true });  

                    },  
                    fail: function (err : any) {  
                        const errMsg = JSON.stringify(err);  
                        console.error("[Payment Flow] ❌ PayPal payment FAILED:", errMsg);  
                        // 使用 modal 弹窗显示错误，确保能看到  
                        uni.showModal({  
                            title: "支付失败 - 调试",  
                            content: errMsg,  
                            showCancel: false  
                        });  
                    },  
                    complete: function (res : any) {  
                        console.log("[Payment Flow] ? PayPal payment COMPLETE (always called):", JSON.stringify(res));  
                    }  
                });