Histórico

O 401 mostra quando tento adicionar o webhook pela função gerencianet.pixConfigWebhook()

public async Task SaveWebhookUrl(Guid chavePix, string webhoookUrl)
{
dynamic efi = new EfiPay(
appSettings.Payment.ClientId,
appSettings.Payment.ClientSecret,
appSettings.Payment.Sandbox,
appSettings.Payment.Certificate
);

var headers = "{\"x-skip-mtls-checking\": \"true\"}";

var param = new
{
chave = chavePix.ToString()
};

var body = new
{
webhookUrl = webhoookUrl
};
var result = Task.FromResult(efi.PixConfigWebhook(param, body, headers));
await Task.FromResult(efi.PixConfigWebhook(param, body, headers));
}

ok, eu fiz essa implementacao
public async Task SaveWebhookUrl(Guid chavePix, string webhoookUrl)
{
dynamic efi = new EfiPay(
appSettings.Payment.ClientId,
appSettings.Payment.ClientSecret,
appSettings.Payment.Sandbox,
appSettings.Payment.Certificate
);

var headers = "{\"x-skip-mtls-checking\": \"true\"}";

var param = new
{
chave = chavePix.ToString()
};

var body = new
{
webhookUrl = webhoookUrl
};

await Task.FromResult(efi.PixConfigWebhook(param, body, headers));
}

https://github.com/efipay/sdk-dotnet-apis-efi/blob/main/Examples/pix/webhooks/PixConfigWebhook.cs