YooKassaNet

dotnet add package YooKassaNet

using YooKassaNet;
using YooKassaNet.Payments;

using var http = new HttpClient();
var payments = new YooKassaPaymentsClient(http, new YooKassaClientOptions
{
    ShopId = "1281498",
    SecretKey = "test_...",
});

var payment = await payments.CreatePaymentAsync(new CreatePaymentRequest
{
    Amount = Money.Rubles(100m),
    Capture = true,
    Confirmation = Confirmation.Redirect("https://example.com/return"),
    Description = "Order #37",
});

Console.WriteLine(payment.Confirmation?.ConfirmationUrl);