diff --git a/coffeecard/CoffeeCard.Library/Services/v2/PurchaseService.cs b/coffeecard/CoffeeCard.Library/Services/v2/PurchaseService.cs
index e6ae0fee..edf02f6b 100644
--- a/coffeecard/CoffeeCard.Library/Services/v2/PurchaseService.cs
+++ b/coffeecard/CoffeeCard.Library/Services/v2/PurchaseService.cs
@@ -339,7 +339,9 @@ public async Task<SimplePurchaseResponse> RefundPurchase(int paymentId)
                 throw new IllegalUserOperationException($"Purchase {purchase.Id} is not in state Completed. Cannot refund");
             }
 
-            var refundSuccess = await _mobilePayPaymentsService.RefundPayment(Guid.Parse(purchase.ExternalTransactionId));
+            // MobilePay requires the amount to be in oere, we store the amount in kroner
+            var amountToRefund = purchase.Price * 100;
+            var refundSuccess = await _mobilePayPaymentsService.RefundPayment(purchase, amountToRefund);
             if (!refundSuccess)
             {
                 Log.Error("Refund of Purchase {PurchaseId} failed", purchase.Id);
diff --git a/coffeecard/CoffeeCard.MobilePay/Service/v2/IMobilePayPaymentsService.cs b/coffeecard/CoffeeCard.MobilePay/Service/v2/IMobilePayPaymentsService.cs
index a960594b..fb2abc2f 100644
--- a/coffeecard/CoffeeCard.MobilePay/Service/v2/IMobilePayPaymentsService.cs
+++ b/coffeecard/CoffeeCard.MobilePay/Service/v2/IMobilePayPaymentsService.cs
@@ -5,6 +5,7 @@
 using CoffeeCard.MobilePay.Generated.Api.WebhooksApi;
 using CoffeeCard.Models.DataTransferObjects.v2.MobilePay;
 using CoffeeCard.Models.DataTransferObjects.v2.Purchase;
+using CoffeeCard.Models.Entities;
 
 namespace CoffeeCard.MobilePay.Service.v2
 {
@@ -47,6 +48,12 @@ public interface IMobilePayPaymentsService
         /// <returns>All Payment Points</returns>
         Task<PaymentPointsList> GetPaymentPoints();
 
-        Task<bool> RefundPayment(Guid paymentId);
+        /// <summary>
+        /// Refund a payment to the customer
+        /// </summary>
+        /// <param name="purchase">Purchase to refund</param>
+        /// <param name="amount">Amount to refund in oere</param>
+        /// <returns>True if refund was successful, false otherwise</returns>
+        Task<bool> RefundPayment(Purchase purchase, int amount);
     }
 }
\ No newline at end of file
diff --git a/coffeecard/CoffeeCard.MobilePay/Service/v2/MobilePayPaymentsService.cs b/coffeecard/CoffeeCard.MobilePay/Service/v2/MobilePayPaymentsService.cs
index 7fa166b5..6a08fc82 100644
--- a/coffeecard/CoffeeCard.MobilePay/Service/v2/MobilePayPaymentsService.cs
+++ b/coffeecard/CoffeeCard.MobilePay/Service/v2/MobilePayPaymentsService.cs
@@ -5,6 +5,7 @@
 using CoffeeCard.MobilePay.Generated.Api.PaymentsApi;
 using CoffeeCard.Models.DataTransferObjects.v2.MobilePay;
 using CoffeeCard.Models.DataTransferObjects.v2.Purchase;
+using CoffeeCard.Models.Entities;
 using Serilog;
 
 namespace CoffeeCard.MobilePay.Service.v2
@@ -84,13 +85,18 @@ public async Task<MobilePayPaymentDetails> GetPayment(Guid paymentId)
             }
         }
 
-        public async Task<bool> RefundPayment(Guid paymentId)
+        public async Task<bool> RefundPayment(Purchase purchase, int amount)
         {
+            if (purchase == null || purchase.ExternalTransactionId == null) throw new ArgumentNullException(nameof(purchase));
             try
             {
                 IssueRefundRequest issueRefundRequest = new IssueRefundRequest
                 {
-                    PaymentId = paymentId
+                    PaymentId = Guid.Parse(purchase.ExternalTransactionId),
+                    Amount = amount,
+                    Description = "Refund of purchase " + purchase.Id,
+                    IdempotencyKey = Guid.NewGuid(),
+                    Reference = purchase.OrderId.ToString()
                 };
                 try
                 {
diff --git a/coffeecard/CoffeeCard.Tests.Unit/Services/v2/PurchaseServiceTests.cs b/coffeecard/CoffeeCard.Tests.Unit/Services/v2/PurchaseServiceTests.cs
index f2a42968..6b02f019 100644
--- a/coffeecard/CoffeeCard.Tests.Unit/Services/v2/PurchaseServiceTests.cs
+++ b/coffeecard/CoffeeCard.Tests.Unit/Services/v2/PurchaseServiceTests.cs
@@ -312,7 +312,7 @@ public async Task RefundPurchaseRefundsAPurchase(Product product)
             await context.SaveChangesAsync();
 
             var mobilePayService = new Mock<IMobilePayPaymentsService>();
-            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Guid>()))
+            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Purchase>(), It.IsAny<int>()))
                 .ReturnsAsync(true);
             var mailService = new Mock<Library.Services.IEmailService>();
             var productService = new ProductService(context);
@@ -378,7 +378,7 @@ public async Task RefundPurchaseThrowsExceptionWhenNotAllowed(Product product)
             await context.SaveChangesAsync();
 
             var mobilePayService = new Mock<IMobilePayPaymentsService>();
-            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Guid>()))
+            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Purchase>(), It.IsAny<int>()))
                 .ReturnsAsync(true);
             var mailService = new Mock<Library.Services.IEmailService>();
             var productService = new ProductService(context);
@@ -442,7 +442,7 @@ public async Task RefundPurchaseThrowsExceptionWhenAlreadyRefunded(Product produ
             await context.SaveChangesAsync();
 
             var mobilePayService = new Mock<IMobilePayPaymentsService>();
-            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Guid>()))
+            mobilePayService.Setup(mps => mps.RefundPayment(It.IsAny<Purchase>(), It.IsAny<int>()))
                 .ReturnsAsync(true);
             var mailService = new Mock<Library.Services.IEmailService>();
             var productService = new ProductService(context);