Form Builder (#4137)

* wip

* Cleanups

* UI updates

* Update UIFormsController.cs

* Make predefined forms usable statically

* Add support for pos app + forms

* pay request form rough support

* invoice form through receipt page

* Display form name in inherit from store setting

* Do not request additional forms on invoice from pay request

* fix up code

* move checkoutform id in checkout appearance outside of checkotu v2 toggle

* general fixes for form system

* fix pav bug

* UI updates

* Fix warnings in Form builder (#4331)

* Fix build warnings about string?

Enable nullable on UIFormsController.cs
Fixes CS8632 The annotation for nullable reference types should only be used in code within a '#nullable' annotations context.

* Clean up lack of space in injected services in Submit() of UIFormsController.cs

* Remove unused variables (CS0219) and assignment of nullable value to nullable type (CS8600)

* Cleanup double semicolons while we're at tit

* Fix: If reverse proxy wasn't well configured, and error message should have been displayed (#4322)

* fix monero issue

* Server Settings: Update Policies page (#4326)

Handles the multiple submit buttons on that page and closes #4319.

Contains some UI unifications with other pages and also shows the block explorers without needing to toggle the section via JS.

* Change confirmed to settled. (#4328)

* POS: Fix null pointer

Introduced in #4307, the referenced object needs to be `itemChoice` instead of `choice`.

* Add documentation link to plugins (#4329)

* Add documentation link to plugins

* Minor UI updates

Co-authored-by: Dennis Reimann <mail@dennisreimann.de>

* Fix flaky test (#4330)

* Fix flaky test

* Update BTCPayServer/PayoutProcessors/BaseAutomatedPayoutProcessor.cs

Co-authored-by: d11n <mail@dennisreimann.de>

Co-authored-by: d11n <mail@dennisreimann.de>

* Remove invoice and store level form

* add form test

* fix migration for forms

* fix

* make pay request form submission redirect to invoice

* Refactor FormQuery to only be able to query single store and single form

* Put the Authorize at controller level on UIForms

* Fix warnings

* Fix ef request

* Fix query to forms, ensure no permission bypass

* Fix modify

* Remove storeId from step form

* Remove useless storeId parameter

* Hide custom form feature in UI

* Minor cleanups

* Remove custom form options from select for now

* More minor syntax cleanups

* Update test

* Add index - needs migration

* Refactoring: Use PostRedirect instead of TempData for data transfer

* Remove untested and unfinished code

* formResponse should be a JObject, not a string

* Fix case for Form type

Co-authored-by: Dennis Reimann <mail@dennisreimann.de>
Co-authored-by: JesterHodl <103882255+jesterhodl@users.noreply.github.com>
Co-authored-by: Nicolas Dorier <nicolas.dorier@gmail.com>
Co-authored-by: Andreas Tasch <andy.tasch@gmail.com>

BTCPayServer/Models/PaymentRequestViewModels/ListPaymentRequestsViewModel.cs

@@ -8,6 +8,7 @@ using BTCPayServer.Services.Invoices;
 using BTCPayServer.Services.Rates;
 using BTCPayServer.Validation;
 using Microsoft.AspNetCore.Mvc.Rendering;
+using Newtonsoft.Json.Linq;
 using PaymentRequestData = BTCPayServer.Data.PaymentRequestData;
 
 namespace BTCPayServer.Models.PaymentRequestViewModels
@@ -35,6 +36,7 @@ namespace BTCPayServer.Models.PaymentRequestViewModels
             StoreId = data.StoreDataId;
             Archived = data.Archived;
             var blob = data.GetBlob();
+            FormId = blob.FormId;
             Title = blob.Title;
             Amount = blob.Amount;
             Currency = blob.Currency;
@@ -44,8 +46,14 @@ namespace BTCPayServer.Models.PaymentRequestViewModels
             CustomCSSLink = blob.CustomCSSLink;
             EmbeddedCSS = blob.EmbeddedCSS;
             AllowCustomPaymentAmounts = blob.AllowCustomPaymentAmounts;
+            FormResponse = blob.FormResponse is null
+                ? null
+                : blob.FormResponse.ToObject<Dictionary<string, object>>();
         }
 
+        [Display(Name = "Request customer data on checkout")]
+        public string FormId { get; set; }
+
         public bool Archived { get; set; }
 
         public string Id { get; set; }
@@ -77,6 +85,8 @@ namespace BTCPayServer.Models.PaymentRequestViewModels
         public string EmbeddedCSS { get; set; }
         [Display(Name = "Allow payee to create invoices in their own denomination")]
         public bool AllowCustomPaymentAmounts { get; set; }
+
+        public Dictionary<string, object> FormResponse { get; set; }
     }
 
     public class ViewPaymentRequestViewModel
@@ -165,6 +175,8 @@ namespace BTCPayServer.Models.PaymentRequestViewModels
         public bool PendingInvoiceHasPayments { get; set; }
         public string HubPath { get; set; }
         public bool Archived { get; set; }
+        public string FormId { get; set; }
+        public bool FormSubmitted { get; set; }
 
         public class PaymentRequestInvoice
         {