feat: adds endpoints 'client contacts' and 'contacts' and integration tests for all existing endpoints.

src/Clients/IPaymoClientsApi.cs

@@ -0,0 +1,14 @@
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Novaloop.PaymoApi.Clients.Models;
+
+namespace Novaloop.PaymoApi.Clients
+{
+    public interface IPaymoClientsApi
+    {
+        Task<IEnumerable<PaymoClient>> GetClients();
+        Task<PaymoClient> GetClient(int clientId);
+        Task<PaymoClient> CreateClient(PaymoClient client);
+        Task DeleteClient(int clientId);
+    }
+}

src/Clients/Models/GetClientsResponse.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+
+namespace Novaloop.PaymoApi.Clients.Models
+{
+    public class GetClientsResponse
+    {
+        public IEnumerable<PaymoClient> Clients { get; set; }
+    }
+}

src/Clients/Models/PaymoClient.cs

@@ -0,0 +1,52 @@
+using Newtonsoft.Json;
+using Novaloop.PaymoApi.Shared;
+
+namespace Novaloop.PaymoApi.Clients.Models
+{
+    public class PaymoClient : BasePaymoModel
+    {
+        [JsonProperty("name")]
+        public string Name { get; set; }
+
+        [JsonProperty("address")]
+        public string Address { get; set; }
+
+        [JsonProperty("city")]
+        public string City { get; set; }
+
+        [JsonProperty("state")]
+        public string State { get; set; }
+
+        [JsonProperty("postal_code")]
+        public string PostalCode { get; set; }
+
+        [JsonProperty("country")]
+        public string Country { get; set; }
+
+        [JsonProperty("phone")]
+        public string Phone { get; set; }
+
+        [JsonProperty("fax")]
+        public string Fax { get; set; }
+
+        [JsonProperty("email")]
+        public string Email { get; set; }
+
+        [JsonProperty("website")]
+        public string Website { get; set; }
+
+        [JsonProperty("image")]
+        public string Image { get; set; }
+
+        [JsonProperty("fiscal_information")]
+        public string FiscalInformation { get; set; }
+
+        [JsonProperty("active")]
+        public bool Active { get; set; }
+
+        public override string ToString()
+        {
+            return $"[{Id}] {Name}";
+        }
+    }
+}

src/Clients/PaymoClientsApi.cs

@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using Novaloop.PaymoApi.Clients.Models;
+using Novaloop.PaymoApi.Extensions;
+using Novaloop.PaymoApi.Shared;
+
+namespace Novaloop.PaymoApi.Clients
+{
+    public class PaymoClientsApi : IPaymoClientsApi
+    {
+        private readonly PaymoApiOptions _options;
+        private readonly HttpClient _client;
+        private const string ResourceUri = "clients";
+
+        public PaymoClientsApi(PaymoApiClient paymoApiClient, IOptions<PaymoApiOptions> options)
+        {
+            _options = options.Value;
+            _client = paymoApiClient.Client;
+        }
+
+        /// <summary>
+        /// Receive all existing clients
+        /// </summary>
+        public async Task<IEnumerable<PaymoClient>> GetClients()
+        {
+            _client.SetApiKeyHeader(_options.ApiToken);
+            var response = await _client.GetAsync($"api/{ResourceUri}");
+            await response.ThrowExceptionWithDetailsIfUnsuccessful();
+            return (await response.Content.ReadAsAsync<GetClientsResponse>()).Clients;
+        }
+
+        /// <summary>
+        /// Retrieve an existing client by id
+        /// </summary>
+        /// <param name="clientId">id of the contact</param>
+        /// <returns></returns>
+        public async Task<PaymoClient> GetClient(int clientId)
+        {
+            _client.SetApiKeyHeader(_options.ApiToken);
+            var response = await _client.GetAsync($"api/{ResourceUri}/{clientId}");
+            await response.ThrowExceptionWithDetailsIfUnsuccessful();
+            return (await response.Content.ReadAsAsync<GetClientsResponse>()).Clients.Single();
+        }
+
+
+        /// <summary>
+        /// Create a new client
+        /// </summary>
+        public async Task<PaymoClient> CreateClient(PaymoClient client)
+        {
+            _client.SetApiKeyHeader(_options.ApiToken);
+            var response = await _client.PostAsJsonAsync($"api/{ResourceUri}", client);
+            await response.ThrowExceptionWithDetailsIfUnsuccessful();
+            return (await response.Content.ReadAsAsync<GetClientsResponse>()).Clients.Single();
+        }
+
+        /// <summary>
+        /// Delete a client
+        /// </summary>
+        /// <param name="clientId"></param>
+        /// <returns></returns>
+        public async Task DeleteClient(int clientId)
+        {
+            _client.SetApiKeyHeader(_options.ApiToken);
+            var response = await _client.DeleteAsync($"api/{ResourceUri}/{clientId}");
+            await response.ThrowExceptionWithDetailsIfUnsuccessful();
+        }
+    }
+}