[Coinbase] withdrawal (#657)

* [Coinbase] withdrawal

* [Coinbase] withdrawal nonce

* Currencies option for testing

Author: bezysoftware

src/ExchangeSharp/API/Exchanges/Coinbase/ExchangeCoinbaseAPI.cs

@@ -555,6 +555,31 @@ protected override async Task<Dictionary<string, decimal>> OnGetAmountsAvailable
 			return amounts;
 		}
 
+		protected override async Task<ExchangeWithdrawalResponse> OnWithdrawAsync(ExchangeWithdrawalRequest request)
+		{
+			var nonce = await GetNoncePayloadAsync();
+			var payload = new Dictionary<string, object>
+			{
+				{ "nonce", nonce },
+				{ "amount", request.Amount },
+				{ "currency", request.Currency },
+				{ "crypto_address", request.Address },
+				{ "add_network_fee_to_total", !request.TakeFeeFromAmount },
+			};
+
+			if (!string.IsNullOrEmpty(request.AddressTag))
+			{
+				payload.Add("destination_tag", request.AddressTag);
+			}
+
+			var result = await MakeJsonRequestAsync<WithdrawalResult>("/withdrawals/crypto", null, payload, "POST");
+
+			return new ExchangeWithdrawalResponse
+			{
+				Id = result.Id
+			};
+		}
+
 		protected override async Task<ExchangeOrderResult> OnPlaceOrderAsync(ExchangeOrderRequest order)
 		{
 			object nonce = await GenerateNonceAsync();

src/ExchangeSharp/API/Exchanges/Coinbase/Models/Response/WithdrawalResult.cs

@@ -0,0 +1,22 @@
+using Newtonsoft.Json;
+
+namespace ExchangeSharp.Coinbase
+{
+	public class WithdrawalResult
+	{
+		[JsonProperty("id")]
+		public string Id { get; set; }
+
+		[JsonProperty("amount")]
+		public string Amount { get; set; }
+
+		[JsonProperty("currency")]
+		public string Currency { get; set; }
+
+		[JsonProperty("fee")]
+		public string Fee { get; set; }
+
+		[JsonProperty("subtotal")]
+		public string Subtotal { get; set; }
+	}
+}

src/ExchangeSharpConsole/Options/CurrenciesOption.cs

@@ -0,0 +1,28 @@
+using CommandLine;
+using ExchangeSharpConsole.Options.Interfaces;
+using Newtonsoft.Json;
+using System;
+using System.Threading.Tasks;
+
+namespace ExchangeSharpConsole.Options
+{
+	[Verb("currencies", HelpText = "Gets a list of currencies available on the exchange")]
+	public class CurrenciesOption : BaseOption, IOptionPerExchange
+	{
+		public string ExchangeName { get; set; }
+
+		public override async Task RunCommand()
+		{
+			using var api = GetExchangeInstance(ExchangeName);
+
+			Authenticate(api);
+
+			var currencies = await api.GetCurrenciesAsync();
+
+			foreach (var c in currencies)
+			{
+				Console.WriteLine($"{c.Key}: {c.Value.FullName}, {c.Value.AltName}");
+			}
+		}
+	}
+}

src/ExchangeSharpConsole/Program.cs

@@ -18,6 +18,7 @@ public partial class Program
 			typeof(CancelOrderOption),
 			typeof(CandlesOption),
 			typeof(ConvertOption),
+			typeof(CurrenciesOption),
 			typeof(ExampleOption),
 			typeof(ExportOption),
 			typeof(InteractiveOption),