diff --git a/BTCPayServer/Controllers/UIInvoiceController.UI.cs b/BTCPayServer/Controllers/UIInvoiceController.UI.cs
index 7c24554ee..f535c2605 100644
--- a/BTCPayServer/Controllers/UIInvoiceController.UI.cs
+++ b/BTCPayServer/Controllers/UIInvoiceController.UI.cs
@@ -1079,18 +1079,6 @@ namespace BTCPayServer.Controllers
             catch { try { webSocket.Dispose(); } catch { } }
         }
 
-        [HttpPost("i/{invoiceId}/UpdateCustomer")]
-        [HttpPost("invoice/UpdateCustomer")]
-        public async Task<IActionResult> UpdateCustomer(string invoiceId, [FromBody] UpdateCustomerModel data)
-        {
-            if (!ModelState.IsValid)
-            {
-                return BadRequest(ModelState);
-            }
-            await _InvoiceRepository.UpdateInvoice(invoiceId, data).ConfigureAwait(false);
-            return Ok("{}");
-        }
-
         [HttpGet("/stores/{storeId}/invoices")]
         [HttpGet("invoices")]
         [Authorize(AuthenticationSchemes = AuthenticationSchemes.Cookie, Policy = Policies.CanViewInvoices)]
diff --git a/BTCPayServer/Models/InvoicingModels/UpdateCustomerModel.cs b/BTCPayServer/Models/InvoicingModels/UpdateCustomerModel.cs
deleted file mode 100644
index 14c86873d..000000000
--- a/BTCPayServer/Models/InvoicingModels/UpdateCustomerModel.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System.ComponentModel.DataAnnotations;
-using BTCPayServer.Validation;
-
-namespace BTCPayServer.Models.InvoicingModels
-{
-    public class UpdateCustomerModel
-    {
-        [MailboxAddress]
-        [Required]
-        public string Email
-        {
-            get; set;
-        }
-    }
-}
diff --git a/BTCPayServer/Services/Invoices/InvoiceRepository.cs b/BTCPayServer/Services/Invoices/InvoiceRepository.cs
index b99c122c9..5c7f5523f 100644
--- a/BTCPayServer/Services/Invoices/InvoiceRepository.cs
+++ b/BTCPayServer/Services/Invoices/InvoiceRepository.cs
@@ -140,35 +140,6 @@ namespace BTCPayServer.Services.Invoices
             return await ctx.Apps.Where(a => a.StoreDataId == storeId && a.TagAllInvoices).ToArrayAsync();
         }
 
-        public async Task UpdateInvoice(string invoiceId, UpdateCustomerModel data)
-        {
-retry:
-            using (var ctx = _applicationDbContextFactory.CreateContext())
-            {
-                var invoiceData = await ctx.Invoices.FindAsync(invoiceId);
-                if (invoiceData == null)
-                    return;
-                var blob = invoiceData.GetBlob();
-                if (blob.Metadata.BuyerEmail == null && data.Email != null)
-                {
-                    if (MailboxAddressValidator.IsMailboxAddress(data.Email))
-                    {
-                        blob.Metadata.BuyerEmail = data.Email;
-                        invoiceData.SetBlob(blob);
-                        AddToTextSearch(ctx, invoiceData, blob.Metadata.BuyerEmail);
-                    }
-                }
-                try
-                {
-                    await ctx.SaveChangesAsync().ConfigureAwait(false);
-                }
-                catch (DbUpdateConcurrencyException)
-                {
-                    goto retry;
-                }
-            }
-        }
-
         public async Task UpdateInvoiceExpiry(string invoiceId, TimeSpan seconds)
         {
 retry: