btcpayserver/BTCPayServer/Views/LNURLAuth/Create.cshtml

@using LNURL
@model Uri
@{
    ViewData.SetActivePage(ManageNavPages.TwoFactorAuthentication, "Register your Lightning node for LNURL Auth");
    Dictionary<string, string> formats = new Dictionary<string, string>()
    {
        { "Bech32", LNURL.EncodeUri(Model, "login", true).ToString().ToUpperInvariant() },
        { "URI", LNURL.EncodeUri(Model, "login", false).ToString().ToUpperInvariant() }
    };
    
    
}

<div class="row">
    <div class="col-lg-8">
        <div id="info-message" class="align-items-center">
            <div class="tab-content">
                @for (int i = 0; i < formats.Count; i++)
                {
                    var mode = formats.ElementAt(i);
                    <div class="tab-pane @(i == 0 ? "active" : "")" id="@mode.Key" role="tabpanel">
                        <div class="qr-container text-center" style="min-height: 256px;">
                            <vc:qr-code data="@mode.Value"></vc:qr-code>
                        </div>
                        <a href="@mode.Value" class="btn btn-primary w-100 mt-2" rel="noreferrer noopener">
                            Open in wallet
                        </a>
                    </div>
                }
            </div>

            <ul class="nav justify-content-center bg-light text-dark my-2">
                @for (int i = 0; i < formats.Count; i++)
                {
                    var mode = formats.ElementAt(i);
                    <li class="nav-item">
                        <a class="nav-link @(i == 0 ? "active" : "")"
                           data-bs-toggle="tab" data-bs-target="#@mode.Key" role="tab"
                           href="#">
                            @mode.Key
                        </a>
                    </li>
                }
            </ul>
            <span>Scan the QR code with your lightning wallet and link to your user account.</span>
        </div>
    </div>
</div>
<script>
    function check(){
        const request = new XMLHttpRequest();    
        request.onload  = function() {
          if (request.readyState === 4 && request.status === 200) {
            setTimeout(check, 1000);
          } else if (request.readyState === 4 ){
              window.location.href = @Safe.Json(Url.Action("RedirectToList", new {successMessage = "The lightning node will now act as a security device for your account"}));
          }
        }
        
        request.open("GET", window.location.pathname + "/check", true);                    
        request.send(new FormData());
    }
    check();
</script>