using System;

using System.Threading.Tasks;

using GraphQL;

using GraphQL.Client.Http;

using GraphQL.Client.Serializer.Newtonsoft;

using System.Text.Json;

using System.Collections.Generic;

​

public class DefaultWalletIdResponse

{

    public string userDefaultWalletId { get; set; }

}

​

public class InvoiceResponse

{

    public MutationData mutationData { get; set; }

    public class MutationData

    {

        public Invoice invoice { get; set; }

        public List<Error> errors { get; set; }

        public class Invoice

        {

            public string paymentRequest { get; set; }

        }

​

        public class Error

        {

            public string message { get; set; }

        }

    }

​

}

​

public class Program

{

    public static async Task Main()

    {

        // main net endpoint: https://api.mainnet.galoy.io/graphql

        var graphQLClient = new GraphQLHttpClient("https://api.staging.galoy.io/graphql", new NewtonsoftJsonSerializer());

        var defaultWalletIdQuery = new GraphQLRequest {

            Query =@"

            query userDefaultWalletId($username: Username!) {

                userDefaultWalletId(username: $username)

            }",

            OperationName = "userDefaultWalletId",

            Variables = new {

                username = "user11" // update with customer username

            }

        };

​

        var graphQLResponse = await graphQLClient.SendQueryAsync<DefaultWalletIdResponse>(defaultWalletIdQuery);

​

        Console.WriteLine("raw response:");

        Console.WriteLine(JsonSerializer.Serialize(graphQLResponse, new JsonSerializerOptions { WriteIndented = true }));

        Console.WriteLine();

        Console.WriteLine($"WalletId: {graphQLResponse.Data.userDefaultWalletId}");

        var createNoAmountInvoiceMutation = new GraphQLRequest {

            Query =@"

            mutation lnNoAmountInvoiceCreateOnBehalfOfRecipient($walletId: WalletId!) {

              mutationData: lnNoAmountInvoiceCreateOnBehalfOfRecipient(

                input: { recipientWalletId: $walletId }

              ) {

                errors {

                  message

                }

                invoice {

                  paymentRequest

                }

              }

            }",

            OperationName = "lnNoAmountInvoiceCreateOnBehalfOfRecipient",

            Variables = new {

                walletId = graphQLResponse.Data.userDefaultWalletId

            }

        };

        var invoiceResponse = await graphQLClient.SendMutationAsync<InvoiceResponse>(createNoAmountInvoiceMutation);

​

        Console.WriteLine("raw response:");

        Console.WriteLine(JsonSerializer.Serialize(invoiceResponse, new JsonSerializerOptions { WriteIndented = true }));

        Console.WriteLine();

        Console.WriteLine($"Invoice: {invoiceResponse.Data.mutationData.invoice.paymentRequest}");

    }

}