微信，支付宝接入

微信支付：

1.装sdk，查看AppID和AppSecret相关信息，
https://www.jianshu.com/p/ddc34f55dc35

2.创建这些是没有支付能力的，需要额外申请，还是根据提示一步步填写，填写完之后会发一封邮件到您的预留的邮箱，然后到商户平台点击打开链接填写资料，最主要的是验证下开户收款账号，
官方说明：
https://pay.weixin.qq.com/wiki/doc/api/app/app.php?chapter=8_1

二。代码部分
1.注册appID

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  
    // Override point for customization after application launch.  
      
    //注册APP,这里的字符串就是Wechat URL Scheme里面对应的ID 也是申请回来的ID，必须一致  
    [WXApi registerApp:@"这里填写申请回来的ID"];  
    return YES;  
}  

2.调后台接口
// 把生成的订单信息组装起来传给后台开发人员（后台的事情，接收会掉就行了）

//参数我传了
{
    attach = "";//公司
    body = "xxxx";//手机号
    clientip = "";//xxx
    "out_trade_no" = "";//xxx
    "total_amount" =; //价格
}
//会掉成功
success{
 NSMutableString *stamp  = [data objectForKey:@"timestamp"];  
          
        //调起微信支付  
        PayReq* req             = [[PayReq alloc] init];  
        req.partnerId           = [data objectForKey:@"partnerid"];  //商家id
        req.prepayId            = [data objectForKey:@"prepayid"];  //预支付订单
        req.nonceStr            = [data objectForKey:@"noncestr"];  //随机串，防重发
        req.timeStamp           = stamp.intValue;  //时间戳，防重发
        req.package             = [data objectForKey:@"package"];  //商家根据财付通文档填写的数据和签名
        req.sign                = [data objectForKey:@"sign"];  //商家根据微信开放平台文档对数据做的签名
 BOOL ret = [WXApi sendReq:request];
    
    if (!ret) {
        [self showPopOnFloatingWindowText:@"未检测到微信，请下载最新版本后再点击微信支付"];
    }else{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(chenggongAct:) name:@"WXPaySuccess" object:nil];
}

}
解释下意思：
{
  "appid" : "wxb4b"，微信开放平台审核通过的AppID
  "noncestr" : "171127dd056d05e423c8b9e",随机字符串
  "package" : "Sign=WXPay", 固定值
  "partnerid" : "130", 微信支付分配的商户ID
  "prepayid" : "wx201609291601", 预支付交易会话ID
  "sign" : "684371081C049B6017641", 签名，除了sign，剩下6个组合的再次签名字符串
  "timestamp" : 147513 当前时间
}

3.Appdelegate 从微信回到app

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {  
    
return       [WXApi handleOpenURL:url delegate:self];
}  
//支付成功时调用，回到第三方应用中  
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {  

return       [WXApi handleOpenURL:url delegate:self];

    
}  

4.微信会掉函数（写在appdelegate里的）

-(void)onResp:(BaseResp*)resp{
    if ([resp isKindOfClass:[PayResp class]]){
        PayResp*response=(PayResp*)resp;
        [[NSNotificationCenter defaultCenter] postNotificationName:@"WXPaySuccess" object:@{@"errCode":@(response.errCode)}];
        switch(response.errCode){
            case WXSuccess:
                NSLog(@"支付成功");
                break;
            default:
                NSLog(@"支付失败，retcode=%d",resp.errCode);
                break;
        }
    }
}

参考链接
https://blog.csdn.net/sheng_bin/article/details/72082764

支付宝：