/*应用ID 微信开放平台审核通过的应用app ID*/
@property (nonatomic, copy) NSString *appid;
/*商户号 微信支付分配的商户号*/
@property (nonatomic, copy) NSString *mch_id;
/*随机字符串 随机字符串，不长于32位*/
@property (nonatomic, copy) NSString *nonce_str;
/*签名*/
@property (nonatomic, copy) NSString *sign;
/*商品描述 天天爱消除-游戏充值。*/
@property (nonatomic, copy) NSString *body;
/*商户订单号*/
@property (nonatomic, copy) NSString *out_trade_no;
/*总金额 订单总金额，单位为分*/
@property (nonatomic, copy) NSString *total_fee;
/*终端IP*/
@property (nonatomic, copy) NSString *spbill_create_ip;
/*通知地址*/
@property (nonatomic, copy) NSString *notify_url;
/*交易类型*/
@property (nonatomic, copy) NSString *trade_type;

- (instancetype)initWithDicInfo:(NSDictionary *)infoDic{

  if (self = [super init]) {

    self.appid = WECHAT_SHARE_APPID;

    self.mch_id = WECHAT_MCH_ID;

    self.nonce_str = [AppMethod getRandomString];

    self.body = @"test";

    self.out_trade_no = [infoDic formateObjectForKey:@"order_no"];

    self.total_fee = [NSString stringWithFormat:@"%@", [infoDic formateObjectForKey:@"amount"]];

    self.spbill_create_ip = [AppMethod deviceIPAdress];

    self.notify_url = [NSString stringWithFormat:@"%@%@", BASE_URL, WECHAT_NOTI_URL];

    self.trade_type = @"APP";

    self.payDic = [NSMutableDictionary dictionary];

    [self.payDic setValue:self.appid forKey:@"appid"];

    [self.payDic setValue:self.mch_id forKey:@"mch_id"];

    [self.payDic setValue:self.nonce_str forKey:@"nonce_str"];

    [self.payDic setValue:self.body forKey:@"body"];

    [self.payDic setValue:self.out_trade_no forKey:@"out_trade_no"];

    [self.payDic setValue:self.total_fee forKey:@"total_fee"];

    [self.payDic setValue:self.spbill_create_ip forKey:@"spbill_create_ip"];

    [self.payDic setValue:self.notify_url forKey:@"notify_url"];

    [self.payDic setValue:self.trade_type forKey:@"trade_type"];

    self.sign = [self partnerSignOrder:self.payDic];

    [self.payDic setValue:self.sign forKey:@"sign"];

  }

  return self;

}
- (NSString *)partnerSignOrder:(NSDictionary*)paramDic{
  NSArray *keyArray = [paramDic allKeys];
  NSMutableArray *sortedKeyArray = [NSMutableArray arrayWithArray:keyArray];
  [sortedKeyArray sortUsingComparator:^NSComparisonResult(NSString* key1, NSString* key2) {
    return [key1 compare:key2];
  }];
  NSMutableString *paramString = [NSMutableString stringWithString:@""];
  // 拼接成 A=B&X=Y
  for (NSString *key in sortedKeyArray){
    if ([paramDic[key] length] != 0){
      [paramString appendFormat:@"&%@=%@", key, paramDic[key]];
    }
  }
  if ([paramString length] > 1){
    [paramString deleteCharactersInRange:NSMakeRange(0, 1)];  // remove first '&'
  }
  [paramString appendFormat:@"&key=%@", WeChatPARTNER_ID];//app密钥
  return [[AppMethod signString:paramString] uppercaseString];
}

AppMethod.m
+ (NSString *)signString:(NSString*)origString{
  const char *original_str = [origString UTF8String];
  unsigned char result[32];
  CC_MD5(original_str, (CC_LONG)strlen(original_str), result);//调用md5
  NSMutableString *hash = [NSMutableString string];
  for (int i = 0; i < 16; i++){
    [hash appendFormat:@"X", result[i]];
  }
  return hash;
}

+ (void)postWechatPayWithUrl:(NSString *)url
           params:(id)params
         andSuccess:(requestSuccessResult)successBlock
         andFailure:(requestFailureResult)failureBlock{
  NSString *string = [params XMLString];//这里需要导入XMLDictionary文件，里面有该方法
  AFHTTPSessionManager *session = [AFHTTPSessionManager manager];
  // 这里传入的XML字符串只是形似XML，但不是正确是XML格式，需要使用AF方法进行转义
  session.responseSerializer = [[AFHTTPResponseSerializer alloc] init];
  [session.requestSerializer setValue:@"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
  [session.requestSerializer setValue:url forHTTPHeaderField:@"SOAPAction"];
  [session.requestSerializer setQueryStringSerializationWithBlock:^NSString *(NSURLRequest *request, NSDictionary *parameters, NSError *__autoreleasing *error) {
    return string;
  }];
  
  [session POST:url parameters:params progress:^(NSProgress * _Nonnull uploadProgress) {
    
  } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
    successBlock(responseObject);
  } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
    HPError *hpError = [HPError errorWithCode:error.code desc:error.description];
    failureBlock(hpError);
  }];
}

HPWechatProduct *product = [[HPWechatProduct alloc] initWithDic:result];
PayReq *req       = [[PayReq alloc] init];
req.partnerId      = product.partnerid;
req.prepayId       = product.prepayid;
req.nonceStr       = product.noncestr;
req.timeStamp      = [product.timestamp intValue];
req.package       = product.package;
req.sign         = product.sign;
BOOL flag = [WXApi sendReq:req];

HPWechatProduct.m
- (instancetype)initWithDic:(NSDictionary *)dic{
  if (self = [super init]) {
    self.appid = WECHAT_SHARE_APPID;
    self.partnerid = mah_id;
    self.prepayid = [dic formateObjectForKey:@"prepay_id"];
    self.package = @"Sign=WXPay";
    self.noncestr = [AppMethod getRandomString];
    self.timestamp = [self getTime];
    NSMutableDictionary *dic = [NSMutableDictionary dictionary];
    [dic setValue:self.appid forKey:@"appid"];
    [dic setValue:self.partnerid forKey:@"partnerid"];
    [dic setValue:self.prepayid forKey:@"prepayid"];
    [dic setValue:self.package forKey:@"package"];
    [dic setValue:self.noncestr forKey:@"noncestr"];
    [dic setValue:self.timestamp forKey:@"timestamp"];
    self.sign = [self partnerSignOrder:dic];
  }
  return self;
}
- (NSString *)partnerSignOrder:(NSDictionary*)paramDic{
  NSArray *keyArray = [paramDic allKeys];
  NSMutableArray *sortedKeyArray = [NSMutableArray arrayWithArray:keyArray];
  [sortedKeyArray sortUsingComparator:^NSComparisonResult(NSString* key1, NSString* key2) {
    return [key1 compare:key2];
  }];
  NSMutableString *paramString = [NSMutableString stringWithString:@""];
  // 拼接成 A=B&X=Y
  for (NSString *key in sortedKeyArray){
    if ([paramDic[key] length] != 0){
      [paramString appendFormat:@"&%@=%@", key, paramDic[key]];
    }
  }
  if ([paramString length] > 1){
    [paramString deleteCharactersInRange:NSMakeRange(0, 1)];  // remove first '&'
  }
  [paramString appendFormat:@"&key=%@", WeChatPARTNER_ID];
  return [[AppMethod signString:paramString] uppercaseString];
}

- (NSString *)getTime{
  NSTimeInterval interval = [[NSDate date] timeIntervalSince1970];
  return [NSString stringWithFormat:@"%ld", (long)interval];
}


AppMethod.m
+ (NSString *)getRandomString
{
  NSString *str = [NSString stringWithFormat:@"%s",genRandomString(32)];
  return str;
}