diff --git a/packages/medusa/src/api/routes/store/carts/__tests__/update-payment-session.js b/packages/medusa/src/api/routes/store/carts/__tests__/update-payment-session.js
index 487e788cf8..9f1df25640 100644
--- a/packages/medusa/src/api/routes/store/carts/__tests__/update-payment-session.js
+++ b/packages/medusa/src/api/routes/store/carts/__tests__/update-payment-session.js
@@ -10,10 +10,10 @@ describe("POST /store/carts/:id/payment-session/update", () => {
       const cartId = IdMap.getId("cartWithPaySessions")
       subject = await request(
         "POST",
-        `/store/carts/${cartId}/payment-session/update`,
+        `/store/carts/${cartId}/payment-sessions/default_provider`,
         {
           payload: {
-            session: {
+            data: {
               data: "Something",
             },
           },
@@ -26,6 +26,12 @@ describe("POST /store/carts/:id/payment-session/update", () => {
     })
 
     it("calls CartService updatePaymentSession", () => {
+      expect(CartServiceMock.setPaymentSession).toHaveBeenCalledTimes(1)
+      expect(CartServiceMock.setPaymentSession).toHaveBeenCalledWith(
+        IdMap.getId("cartWithPaySessions"),
+        "default_provider"
+      )
+
       expect(CartServiceMock.updatePaymentSession).toHaveBeenCalledTimes(1)
       expect(CartServiceMock.updatePaymentSession).toHaveBeenCalledWith(
         IdMap.getId("cartWithPaySessions"),
diff --git a/packages/medusa/src/services/__mocks__/cart.js b/packages/medusa/src/services/__mocks__/cart.js
index 885369456c..b674e63e9b 100644
--- a/packages/medusa/src/services/__mocks__/cart.js
+++ b/packages/medusa/src/services/__mocks__/cart.js
@@ -323,6 +323,9 @@ export const CartServiceMock = {
   applyDiscount: jest.fn().mockImplementation((cartId, code) => {
     return Promise.resolve()
   }),
+  setPaymentSession: jest.fn().mockImplementation(cartId => {
+    return Promise.resolve()
+  }),
   setPaymentSessions: jest.fn().mockImplementation(cartId => {
     return Promise.resolve()
   }),