Adyen hpp page integration in iOS always giving merchant signature not valid error

user_1635031 0
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I am trying to integrate Adyen payment in iOS through HPP method. Constantly getting Merchant signature was not valid error, I am suspecting some issue with the encoding part.

Following is the code snippet I use to create request body

var urlComponents = URLComponents()
urlComponents.queryItems = []
let contentKeys1: [String] = Array(content.keys)
for contentKey in contentKeys1 {
    if let contentValue = content[contentKey] {
        urlComponents.queryItems?.append(URLQueryItem(name: contentKey, value: contentValue))
    }
}
self.httpBody = urlComponents.query?.data(using: .utf8)

In Android, it's working fine and I used android created string in iOS to test and the payment page is launching without any error.

Following is the Android code snippet to create request body

val query = StringBuilder()
if (providerDataset != null) {
  for (providerData: ProviderData in providerDataset) {
      val key = providerData.key
      var value: String? = ""
      try {
           if (providerData.value != null)
               value = URLEncoder.encode(providerData.value, StandardCharsets.UTF_8.toString())
      } catch (e: UnsupportedEncodingException) {
           e.printStackTrace()
      }
      val str = "$key=$value"
      query.append(str).append("&")
  }
}
return query.deleteCharAt(query.length - 1).toString()

Do we have an encoding method in iOS that does the same job as Android in the above code?

Struggling for many days to figure this out. Any help is highly appreciable

adyen ios
1 Answers

You put the query parameters inside the httpBody. Instead, you need to add them to the URL.

To do this I use the following code generated by Paw:

protocol URLQueryParameterStringConvertible {
    var queryParameters: String {get}
}

extension Dictionary : URLQueryParameterStringConvertible {
    /**
     This computed property returns a query parameters string from the given NSDictionary. For
     example, if the input is @{@"day":@"Tuesday", @"month":@"January"}, the output
     string will be @"day=Tuesday&month=January".
     @return The computed parameters string.
    */
    var queryParameters: String {
        var parts: [String] = []
        for (key, value) in self {
            let part = String(format: "%@=%@",
                String(describing: key).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!,
                String(describing: value).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!)
            parts.append(part as String)
        }
        return parts.joined(separator: "&")
    }
    
}

extension URL {
    /**
     Creates a new URL by adding the given query parameters.
     @param parametersDictionary The query parameter dictionary to add.
     @return A new URL.
    */
    func appendingQueryParameters(_ parametersDictionary : Dictionary<String, String>) -> URL {
        let URLString : String = String(format: "%@?%@", self.absoluteString, parametersDictionary.queryParameters)
        return URL(string: URLString)!
    }
}

Usage

let url = URL(string: "https://google.com/")!
    .appendingQueryParameters([
        "key1": "val1",
        "key2": "val2",
    ])
let request = URLRequest(url: url)
// run request
user_35857960
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