Authorization required error during braintree integration in swift - ios

Question

I am trying to integrate braintree payment method in my swift code, but I am stuck in here, it is breaking with an error
{"error":{"statusCode":401,"name":"Error","message":"Authorization Required","code":"AUTHORIZATION_REQUIRED"}}
I have doing exactly the same as mentioned in braintree documentation. I don't know which authorization it is demanding, I do have a authorization token assigned to user when he/she logins, I am wondering if it is demanding that authorization token, but there is no such parameter in this code where I should place that token to generate client's token for payment method. Here the print statement when exeuted gives me this in log, "client Token is :
{"error":{"statusCode":401,"name":"Error","message":"Authorization Required","code":"AUTHORIZATION_REQUIRED"}}", I am bit confused in its calling also. I have just started these thing so I am very sorry I have done any obvious mistake. Thanks.
// TODO: Switch this URL to your own authenticated API
let clientTokenURL = NSURL(string: "https://braintree-sample-
merchant.herokuapp.com/client_token")!
let clientTokenRequest = NSMutableURLRequest(url:
clientTokenURL as URL)
clientTokenRequest.setValue("text/plain", forHTTPHeaderField:
"Accept")
URLSession.shared.dataTask(with: clientTokenRequest as
URLRequest) { (data, response, error) -> Void in
// TODO: Handle errors
if let error = error {
print("Error: \(error.localizedDescription)")
} else {
print("in Session")
let clientToken = String(data: data!, encoding:
String.Encoding.utf8)!
print("Client Token is : \(clientToken)")
}
}.resume()
}

Answer 1

One have to give authorization token in headers to avoid this error. Rather than that, this version of code will work fine.
completionHandler:#escaping (_ response: NSDictionary?, _ error: Error?) -
> ()) {
var headers: HTTPHeaders
// pass the authToken when you get when user login
let authToken = getAuthorizationToken()
if(self.isValidString(object: authToken as AnyObject)) {
headers = ["Authorization": authToken,
"Content-Type": "application/json",
"Accept": "application/json"]
} else {
headers = ["Content-Type": "application/json"]
}
AF.request(apiURL, method: .get, parameters: params as? Parameters,
encoding: JSONEncoding.default, headers: headers).validate().responseJSON
{
response in
self.handleResposne(response: response) { (response, error) in
completionHandler(response, error)
}
}
}