Exchange_Token call with .net client on Plaid API failing with exception
c#, plaid, stripe-payments, stripe.net
Solution
You're probably using .NET 4.5, in which TLS 1.2 wasn't enabled by default, so you need to explicitly enable TLS 1.2 for outbound connections in your C# code. You can do this with:
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls
(Source: https://stackoverflow.com/a/35321007/5307473)
Problem
I'm trying to call on the Plaid test environment to integrate Stripe with Plaid using a C# client. However I'm unable to get the token exchanged, whereas I can successfully do so with a curl client. The code is super simple. ``` public async Task<string> ExchangeToken(string publicToken, string accountId) { string bankAccountToken = null; try { var parameters = new Dictionary<string, string>() { {"client_id", this.clientId}, {"secret", this.clientSecret}, {"public_token", publicToken}, {"account_id", accountId} }; using (var client = new HttpClient()) { var request = new HttpRequestMessage() { RequestUri = new Uri(this.BaseAddress, "exchange_token"), Method = HttpMethod.Post, Content = new FormUrlEncodedContent(parameters) }; var requestResult = await client.SendAsync(request); var stringResponse = requestResult.Content.ReadAsStringAsync(); } } catch (Exception ex) { Trace.TraceError("PlaidHelper::ExchangeToken() hit error " + ex.Message); } return bankAccountToken; } ``` The call fails with an IO exception saying the remote party closed the connection, the inner exception message is `"Authentication failed because the remote party has closed the transport stream."` Anyone have any ideas? I'm about ready to pull my hair out.. Here's the corresponding `curl` call that succeeds. ``` $ curl -v https://tartan.plaid.com/exchange_token -d client_id="XXXXX" -d secret="XXXXXXXXXXXXXXXX" -d public_token="XXXXXXXXXXX" -d account_id="XXXXX" > POST /exchange_token HTTP/1.1 > Host: tartan.plaid.com > User-Agent: curl/7.50.3 > Accept: */* > Content-Length: 263 > Content-Type: application/x-www-form-urlencoded > } [263 bytes data] * upload completely sent off: 263 out of 263 bytes { [5 bytes data] < HTTP/1.1 200 OK < Content-Type: application/json; charset=utf-8 < Date: Thu, 27 Oct 2016 04:55:53 GMT < Vary: X-HTTP-Method-Override, Accept-Encoding < X-Request-Id: 65af9ef1009c46f5b9f484b5c6aee975 < Content-Length: 295 < Connection: keep-alive < { [295 bytes data] * Curl_http_done: called premature == 0 100 558 100 295 100 263 262 233 0:00:01 0:00:01 --:--:-- 273{ "access_token": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "account_id": "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "stripe_bank_account_token": "btok_XXXXXXXXXXX" } * Connection #0 to host tartan.plaid.com left intact ```