关于京东支付其实不难，最难的在于京东官方没有给出文档。经过和后台的协商，所以参数都提交至后台加密。 京东支付实际上就是一个H5页面，只需要提交对应参数就行。

    NSMutableDictionary *formDic = [[NSMutableDictionary alloc] init];
    [formDic setObject:@"version" forKey:@"version"];
    [formDic setObject:self.sign forKey:@"sign"];
    [formDic setObject:@"merchant" forKey:@"merchant"];
    [formDic setObject:self.device forKey:@"device"];
    [formDic setObject:self.tradeNum forKey:@"tradeNum"];
    [formDic setObject:self.tradeName forKey:@"tradeName"];
    [formDic setObject:self.tradeTime forKey:@"tradeTime"];
    [formDic setObject:self.amount forKey:@"amount"];
    [formDic setObject:self.orderType forKey:@"orderType"];
    [formDic setObject:self.currency forKey:@"currency"];
    [formDic setObject:self.callbackUrl forKey:@"callbackUrl"];
    [formDic setObject:self.notifyUrl forKey:@"notifyUrl"];
    [formDic setObject:self.userType forKey:@"userType"];
    [formDic setObject:self.userId forKey:@"userId"];
    [formDic setObject:self.orderGoodsNum forKey:@"orderGoodsNum"];
    
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    
    manager.responseSerializer = [AFJSONResponseSerializer new];
    
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", @"text/html", nil];
    manager.responseSerializer=[AFHTTPResponseSerializer serializer];
    
    [manager POST:@"https://h5pay.jd.com/jdpay/saveOrder" parameters:formDic progress:^(NSProgress * _Nonnull uploadProgress) {
        
        
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        
        NSString *htmlstring=[[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding];
        //将第二次请求出来的html字符串加载到webview
        [self.webView loadHTMLString:htmlstring baseURL:[NSURL URLWithString:@"https://h5pay.jd.com/jdpay/saveOrder"]];
        
        NSLog(@"WEB: %@", responseObject);
        
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        
    }];