Cscart Multivendor Mobile App Source code not working with Store Builder

We have cscart Mobile App source code built in React native which we got along with Multivendor license.

Please let me know if the same source code will work with Store Builder also as when we tried the same then the “Add To cart” functionality stops working and gives 403 error.

How can we make it working with Store Builder Ultimate

Any help on this is appreciated