public static async Task <string> UpdateInvoice(string invoiceId)
{
StripeConfiguration.SetApiKey("sk_test_5nCTR2UZmnOPWgZASvirbYDy");
StripeInvoiceUpdateOptions invoiceOptions = new StripeInvoiceUpdateOptions()
{
Closed = false
};
StripeInvoiceService invoiceService = new StripeInvoiceService();
//"in_1D18zxHWpLOEdy24Tgw0TzEq"
// |
// V
StripeInvoice invoice = await invoiceService.UpdateAsync(invoiceId, invoiceOptions);
return("OK");
}