/// <summary>
/// Get access token to PayPal api
/// </summary>
/// <param name="http"></param>
/// <returns>PayPal access token</returns>
private async Task <PayPalAPIAccessToken> GetPayPalAccessToken(HttpClient http)
{
try {
byte[] clientCredentials = Encoding.UTF8.GetBytes($"{configuration["PayPal:clientId"]}:{configuration["PayPal:clientSecret"]}");
tokenMsg.Headers.Authorization = new AuthenticationHeaderValue("Basic", Convert.ToBase64String(clientCredentials));
var formURL = new Dictionary <string, string>
{
{ "grant_type", "client_credentials" }
};
tokenMsg.Content = new FormUrlEncodedContent(formURL);
HttpResponseMessage httpResponseMsg = await http.SendAsync(tokenMsg);
string responseContent = await httpResponseMsg.Content.ReadAsStringAsync();
PayPalAPIAccessToken palAcess = JsonConvert.DeserializeObject <PayPalAPIAccessToken>(responseContent);
return(palAcess);
}catch (Exception ex)
{
Console.WriteLine(ex);
return(null);
}
}
/// <summary>
/// Send payment request to PayPal api
/// </summary>
/// <param name="http"></param>
/// <param name="acess"></param>
/// <param name="total"></param>
/// <param name="currency"></param>
/// <returns>PayPalApi response</returns>
private async Task <PayPalAPIResponse> SendPayPalPayment(HttpClient http, PayPalAPIAccessToken acess, double total, string currency)
{
try
{
paymentMsg.Headers.Authorization = new AuthenticationHeaderValue("Bearer", acess.access_token);
var payment = JObject.FromObject(new
{
intent = "sale",
redirect_urls = new
{
return_url = configuration["PayPal:returnUrl"],
cancel_url = configuration["PayPal:cancelUrl"]
},
payer = new { payment_method = "paypal" },
transactions = JArray.FromObject(new[]
{
new
{
amount = new
{
total,
currency
}
}
})
});
paymentMsg.Content = new StringContent(JsonConvert.SerializeObject(payment), Encoding.UTF8, "application/json");
HttpResponseMessage responseMessage = await http.SendAsync(paymentMsg);
string content = await responseMessage.Content.ReadAsStringAsync();
PayPalAPIResponse payPalPayment = JsonConvert.DeserializeObject <PayPalAPIResponse>(content);
return(payPalPayment);
}
catch (Exception ex)
{
Console.WriteLine(ex);
return(null);
}
}
/// <summary>
/// Get redirected to PayPal payment page if response is successful
/// </summary>
/// <param name="total"></param>
/// <param name="currency"></param>
/// <returns>PayPal URL</returns>
public async Task <string> GetRedirectURLToPayPal(double total, string currency)
{
try
{
return(Task.Run(async() =>
{
HttpClient http = GetPayPalSandBoxAccountHttp();
PayPalAPIAccessToken accessToken = await GetPayPalAccessToken(http);
PayPalAPIResponse createdPayment = await SendPayPalPayment(http, accessToken, total, currency);
return createdPayment.links.First(a => a.rel == "approval_url").href;
}
).Result);
}
catch (Exception ex)
{
Console.WriteLine(ex);
return(null);
}
}
