diff --git a/BTCPayServer.Client/Models/InvoiceData.cs b/BTCPayServer.Client/Models/InvoiceData.cs
index 5a05f09a2..89d21f63b 100644
--- a/BTCPayServer.Client/Models/InvoiceData.cs
+++ b/BTCPayServer.Client/Models/InvoiceData.cs
@@ -26,6 +26,7 @@ namespace BTCPayServer.Client.Models
             public SpeedPolicy? SpeedPolicy { get; set; }
 
             public string[] PaymentMethods { get; set; }
+            public string DefaultPaymentMethod { get; set; }
 
             [JsonConverter(typeof(TimeSpanJsonConverter.Minutes))]
             [JsonProperty("expirationMinutes")]
diff --git a/BTCPayServer/Controllers/GreenField/InvoiceController.cs b/BTCPayServer/Controllers/GreenField/InvoiceController.cs
index cfcb23938..f237c11a2 100644
--- a/BTCPayServer/Controllers/GreenField/InvoiceController.cs
+++ b/BTCPayServer/Controllers/GreenField/InvoiceController.cs
@@ -407,6 +407,7 @@ namespace BTCPayServer.Controllers.GreenField
                     PaymentTolerance = entity.PaymentTolerance,
                     PaymentMethods =
                         entity.GetPaymentMethods().Select(method => method.GetId().ToStringNormalized()).ToArray(),
+                    DefaultPaymentMethod = entity.DefaultPaymentMethod,
                     SpeedPolicy = entity.SpeedPolicy,
                     DefaultLanguage = entity.DefaultLanguage,
                     RedirectAutomatically = entity.RedirectAutomatically,
diff --git a/BTCPayServer/Controllers/InvoiceController.cs b/BTCPayServer/Controllers/InvoiceController.cs
index 31811ed67..4c52d60ed 100644
--- a/BTCPayServer/Controllers/InvoiceController.cs
+++ b/BTCPayServer/Controllers/InvoiceController.cs
@@ -178,6 +178,7 @@ namespace BTCPayServer.Controllers
             }
             entity.SpeedPolicy = invoice.Checkout.SpeedPolicy ?? store.SpeedPolicy;
             entity.DefaultLanguage = invoice.Checkout.DefaultLanguage;
+            entity.DefaultPaymentMethod = invoice.Checkout.DefaultPaymentMethod;
             entity.RedirectAutomatically = invoice.Checkout.RedirectAutomatically ?? storeBlob.RedirectAutomatically;
             IPaymentFilter? excludeFilter = null;
             if (invoice.Checkout.PaymentMethods != null)
diff --git a/BTCPayServer/wwwroot/swagger/v1/swagger.template.invoices.json b/BTCPayServer/wwwroot/swagger/v1/swagger.template.invoices.json
index e55b306b1..b96b99072 100644
--- a/BTCPayServer/wwwroot/swagger/v1/swagger.template.invoices.json
+++ b/BTCPayServer/wwwroot/swagger/v1/swagger.template.invoices.json
@@ -1025,6 +1025,11 @@
                         },
                         "description": "A specific set of payment methods to use for this invoice (ie. BTC, BTC-LightningNetwork). By default, select all payment methods enabled in the store."
                     },
+                    "defaultPaymentMethod": {
+                        "type": "string",
+                        "nullable": true,
+                        "description": "Default payment type for the invoice (e.g., BTC, BTC_LightningLike). Default payment method set for the store is used if this parameter is not specified."
+                    },
                     "expirationMinutes": {
                         "nullable": true,
                         "description": "The number of minutes after which an invoice becomes expired. Defaults to the store's settings. (The default store settings is 15)",