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OnboardingHttpClient.cs

using System.Text;
using Microsoft.Net.Http.Headers;
using Newtonsoft.Json;
using Nop.Core;
using Nop.Plugin.Payments.PayPalCommerce.Domain.Onboarding;

namespace Nop.Plugin.Payments.PayPalCommerce.Services;

/// 
/// Represents HTTP client to request onboarding services
/// 
public class OnboardingHttpClient
{
    #region Fields

    protected readonly HttpClient _httpClient;

    #endregion

    #region Ctor

    public OnboardingHttpClient(HttpClient httpClient)
    {
        //configure client
        httpClient.BaseAddress = new Uri(PayPalCommerceDefaults.Onboarding.ServiceUrl);
        httpClient.Timeout = TimeSpan.FromSeconds(PayPalCommerceDefaults.Onboarding.RequestTimeout);
        httpClient.DefaultRequestHeaders.Add(HeaderNames.UserAgent, PayPalCommerceDefaults.UserAgent);
        httpClient.DefaultRequestHeaders.Add(HeaderNames.Accept, MimeTypes.ApplicationJson);

        _httpClient = httpClient;
    }

    #endregion

    #region Methods

    /// 
    /// Request services
    /// 
    /// Request type
    /// Response type
    /// Request
    /// The asynchronous task whose result contains response details
    public async Task RequestAsync(TRequest request) where TRequest : Request where TResponse : class
    {
        try
        {
            //prepare request parameters
            var requestString = JsonConvert.SerializeObject(request);
            var requestContent = new StringContent(requestString, Encoding.Default, MimeTypes.ApplicationJson);

            //execute request and get response
            var requestMessage = new HttpRequestMessage(new HttpMethod(request.Method), request.Path) { Content = requestContent };
            var httpResponse = await _httpClient.SendAsync(requestMessage);
            httpResponse.EnsureSuccessStatusCode();

            //return result
            var responseString = await httpResponse.Content.ReadAsStringAsync();
            var result = JsonConvert.DeserializeObject>(responseString);
            if (result.Result == ResponseResult.Error)
                throw new NopException($"Onboarding error - {result.Error}");

            return result.Data;
        }
        catch (AggregateException exception)
        {
            //rethrow actual exception
            throw exception.InnerException;
        }
    }

    #endregion
}