diff --git a/juice.go b/juice.go
index 95839df..9e83cf0 100644
--- a/juice.go
+++ b/juice.go
@@ -101,8 +101,8 @@ func (cl *Client) UpdateAccount(webhook, businessAddress, domain string) (Accoun
 
 // TopUpFloat allows an integrator to top up float balance.
 //This endpoint is only available in the sandbox environment.
-func (cl *Client) TopUpFloat(amount int) (TopUpFloatResp, error) {
-	var res TopUpFloatResp
+func (cl *Client) TopUpFloat(amount int) (Resp, error) {
+	var res Resp
 	err := cl.patch("/card-integrators/top-up-float", &TopUpFloatData{amount}, &res)
 	return res, err
 }
@@ -191,6 +191,13 @@ func (cl *Client) GetTransaction(trxId string) (TransactionResp, error) {
 	return res, err
 }
 
+//MockTransaction mocks card transaction. This endpoint is only available in the sandbox environment.
+func (cl *Client) MockTransaction(data MockTransactionData, cardId string) (Resp, error) {
+	var res Resp
+	err := cl.post(fmt.Sprintf("/cards/%s/mock-transaction", cardId), data, &res)
+	return res, err
+}
+
 func (cl Client) Health() (string, error) {
 	resp, err := http.Get(fmt.Sprintf("%s/health/live", cl.baseURL))
 	body, _ := ioutil.ReadAll(resp.Body)
diff --git a/req_resp.go b/req_resp.go
index ca627bd..616689f 100644
--- a/req_resp.go
+++ b/req_resp.go
@@ -56,6 +56,11 @@ type PaymentData struct {
 	CardId string `json:"card_id"`
 }
 
+type MockTransactionData struct {
+	Amount int    `json:"amount"`
+	Type   string `json:"type"`
+}
+
 type AccountResp struct {
 	Data Account `json:"data"`
 }
@@ -108,6 +113,6 @@ type BalanceResp struct {
 	Id       string `json:"id"`
 }
 
-type TopUpFloatResp struct {
+type Resp struct {
 	Message string `json:"message"`
 }