working with the latest token sent in my web service - ios

Question

I have a problem to find the latest token .. back end make the token change in every request so if I use it once it turned to be invalid in the next time, and they send the next valid token in Authorization header.
I am trying to get the latest token.
+(void)askServerUsingToken:(void (^)(NSDictionary * json,bool isSuccess))completionBlock{
// NSString* urlString = [NSString stringWithFormat:#"%#%#",baseURL,action];
//check token
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *token = [defaults stringForKey:#"token"];
if (token!= nil) {
NSString *finalyToken = [[NSString alloc]initWithFormat:#"%#",token];
NSString *profile=[NSString stringWithFormat:#"%#profile?token=%#",baseURL,finalyToken];
NSLog(#"%#",profile);
AFHTTPSessionManager *manager=[AFHTTPSessionManager manager];
manager.responseSerializer=[AFJSONResponseSerializer serializer];
[manager.requestSerializer setValue:finalyToken forHTTPHeaderField:#"Authorization"];
[manager GET:profile parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject){
dispatch_async(dispatch_get_main_queue(), ^{
// NSError *errorJson=nil;
// NSDictionary *jsonList=[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&errorJson];
NSDictionary *jsonList=(NSDictionary*)responseObject;
// completionBlock(jsonList,true);
if (jsonList !=nil) {
completionBlock(jsonList,true);
}else{
completionBlock(jsonList,false);
}
});
}failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error){
dispatch_async(dispatch_get_main_queue(),^{
completionBlock(nil,false);
});
}];
}else{
NSLog(#"no token");
}`enter code here`
}