Signed-in shoppers use GET /auth/v1/cart/, POST /auth/v1/cart/add/, PATCH /auth/v1/cart/item/<id>/, remove, clear, and POST /auth/v1/purchases/bulk/ for checkout.
GET /auth/v1/cart/
POST /auth/v1/cart/add/
PATCH /auth/v1/cart/item/<id>/
POST /auth/v1/purchases/bulk/
Your cart is empty.
