Where does authorization code go in C# PayPal REST API Winforms app?

Question

I'm trying to access PayPal's API to submit invoices to clients through a C#.NET Winforms app, but I am terribly confused. Another user posted this code as a solution to connect:

public class PayPalClient { public async Task RequestPayPalToken() { // Discussion about SSL secure channel // http://stackoverflow.com/questions/32994464/could-not-create-ssl-tls-secure-channel-despite-setting-servercertificatevalida ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true; ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12; try { // ClientId of your Paypal app API string APIClientId = "**_[your_API_Client_Id]_**"; // secret key of you Paypal app API string APISecret = "**_[your_API_secret]_**"; using (var client = new System.Net.Http.HttpClient()) { var byteArray = Encoding.UTF8.GetBytes(APIClientId + ":" + APISecret); client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(byteArray)); var url = new Uri("https://api.sandbox.paypal.com/v1/oauth2/token", UriKind.Absolute); client.DefaultRequestHeaders.IfModifiedSince = DateTime.UtcNow; var requestParams = new List<KeyValuePair<string, string>> { new KeyValuePair<string, string>("grant_type", "client_credentials") }; var content = new FormUrlEncodedContent(requestParams); var webresponse = await client.PostAsync(url, content); var jsonString = await webresponse.Content.ReadAsStringAsync(); // response will deserialized using Jsonconver var payPalTokenModel = JsonConvert.DeserializeObject<PayPalTokenModel>(jsonString); } } catch (System.Exception ex) { //TODO: Log connection error } } } public class PayPalTokenModel { public string scope { get; set; } public string nonce { get; set; } public string access_token { get; set; } public string token_type { get; set; } public string app_id { get; set; } public int expires_in { get; set; } }

I'm afraid this is at least one step ahead of me as I can't figure out where in my project it is appropriate to paste the code. Let's just say you created a brand new C# Winforms app. Without getting into the specifics of creating an invoice, etc. What code would I need to support the PayPal API and where in the project does it go? I know I need to get authorization for the app from PayPal, but I'm having trouble finding a good "Getting Started" guide for C# and PayPal. I've created a REST API app on PayPal, so I do have a client ID and "secret" to pass for Oauth authorization - I just can't find a place to do that.

Thanks in advance. I have some C#.net programming experience, but honestly my programming experience mostly goes back to VB6 so I kind of need the big picture explanation. Thanks for your patience!!

Side note, don't create a new HttpClient for every request.

maccettura
– maccettura

2017-06-28 20:47:53 +00:00
Commented Jun 28, 2017 at 20:47 — maccettura
– maccettura, Commented Jun 28, 2017 at 20:47

Michael Lewis · Accepted Answer · 2017-09-01 00:29:16Z

Sorry for posting an answer here but I currently do not have enough reputation to post comment. However if you are still looking for a general idea on how to get this done then I can provide a brief example. Since you are using WinForms and PayPal's API, I am assuming you have setup your App.Config file already?

Example-

 <!-- PayPal SDK settings --> <paypal> <settings> <add name="mode" value="sandbox" /> <add name="clientId" value="insert_clientid_key_here" /> <add name="clientSecret" value="Insert_client_secret_key_here" /> </settings> </paypal>

Once this has been addressed then you can make your way over to your form and input what you are going to use. Example:

using System; using System.Windows.Forms; using PayPal.Api; using System.Collections.Generic;

Now that is completed you can create a button to make the API Call.

Example:

 private void button1_Click_1(object sender, EventArgs e) { // Authenticate with PayPal var config = ConfigManager.Instance.GetProperties(); var accessToken = new OAuthTokenCredential(config).GetAccessToken(); var apiContext = new APIContext(accessToken); // Make an API call var payment = Payment.Create(apiContext, new Payment { intent = "sale", payer = new Payer { payment_method = "paypal" }, transactions = new List<Transaction> { new Transaction { description = "Transaction description.", invoice_number = "001", amount = new Amount { currency = "USD", total = "100.00", details = new Details { tax = "15", shipping = "10", subtotal = "75" } }, item_list = new ItemList { items = new List<Item> { new Item { name = "Item Name", currency = "USD", price = "15", quantity = "5", sku = "sku" } } } } }, redirect_urls = new RedirectUrls { return_url = "http://x.com/return", cancel_url = "http://x.com/cancel" } }); MessageBox.Show("API Request Sent to Paypal"); }

Once completed, test it out and you should have a sandbox call waiting for you.

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