diff --git a/services/121-service/src/payments/fsp-integration/intersolve-visa/intersolve-visa.api.service.ts b/services/121-service/src/payments/fsp-integration/intersolve-visa/intersolve-visa.api.service.ts
index bb73d20904..cca169efc8 100644
--- a/services/121-service/src/payments/fsp-integration/intersolve-visa/intersolve-visa.api.service.ts
+++ b/services/121-service/src/payments/fsp-integration/intersolve-visa/intersolve-visa.api.service.ts
@@ -447,7 +447,7 @@ export class IntersolveVisaApiService {
     reference: string;
   }): Promise<void> {
     const uuid = generateUUIDFromSeed(reference);
-    const amountInCent = amountInMajorUnit * 100;
+    const amountInCent = Math.round(amountInMajorUnit * 100); // Math round is needed to prevent floating point errors
 
     const transferRequestDto: TransferRequestIntersolveApiDto = {
       quantity: {
diff --git a/services/mock-service/src/fsp-integration/intersolve-visa/intersolve-visa.mock.service.ts b/services/mock-service/src/fsp-integration/intersolve-visa/intersolve-visa.mock.service.ts
index 937e8c2d6a..20a2ea04fc 100644
--- a/services/mock-service/src/fsp-integration/intersolve-visa/intersolve-visa.mock.service.ts
+++ b/services/mock-service/src/fsp-integration/intersolve-visa/intersolve-visa.mock.service.ts
@@ -664,6 +664,24 @@ export class IntersolveVisaMockService {
         },
       };
     }
+    // Return error if the amount is not an integer
+    // If we post a non integer to the real API, it will return a similar error
+    if (!Number.isInteger(amount)) {
+      return {
+        status: HttpStatus.BAD_REQUEST,
+        statusText: 'Bad Request',
+        data: {
+          success: false,
+          errors: [
+            {
+              code: 'INVALID_PARAMETERS',
+              description:
+                'The JSON value could not be converted to System.Int32',
+            },
+          ],
+        },
+      };
+    }
 
     return {
       status: HttpStatus.OK,