diff --git a/LittleShop/Services/SilverPayService.cs b/LittleShop/Services/SilverPayService.cs
index 15fd11f..cdb7251 100644
--- a/LittleShop/Services/SilverPayService.cs
+++ b/LittleShop/Services/SilverPayService.cs
@@ -99,7 +99,7 @@ public class SilverPayService : ISilverPayService
             var request = new
             {
                 external_id = externalId,
-                amount = amount,  // Amount in GBP
+                fiat_amount = amount,  // Amount in GBP
                 fiat_currency = "GBP",
                 currency = currencyCode,
                 webhook_url = webhookUrl ?? defaultWebhookUrl,