btcpayserver/BTCPayServer/Views/Shared/_Form.cshtml

@model BTCPayServer.Abstractions.Form.Form

@foreach (var fieldset in Model.Fieldsets)
{
    <fieldset>
        <legend>@fieldset.Label</legend>
        @foreach (var field in fieldset.Fields)
        {
@if ("text".Equals(field.Type))
{
    <div class="form-group">
        @if (field.Required)
        {
            <label class="form-label" for="@field.Name" data-required>
                @field.Label
            </label>
        }
        else
        {
            <label class="form-label" for="@field.Name">
                @field.Label
            </label>
        }

        <input class="form-control @(@field.IsValid() ? "" : "is-invalid")" id="@field.Name" type="text" required="@field.Required" name="@field.Name" value="@field.Value" aria-describedby="HelpText@field.Name"/>
        <small id="HelpText@field.Name" class="form-text text-muted">
            @field.HelpText
        </small>

    </div>
}
        }
    </fieldset>
}