I was able to sign in using
/rest/V1/integration/customer/token and add items to cart. How do I view the cart (items I added using REST API) as a customer from front-end?
I want synchronize api cart with cart frontend.
I know the question was posted a while ago but I will leave it here for a reference.
Magento keeps products you put to the cart on the server side. If you log in on the front-end as the same customer as using REST API, you should be able to see the products in the cart.
It works on a clean installation of Magento 2, an example of which you can find under the following link. Credentials are:
If it does not work on your instance, you need to check if nothing changes the default behaviour.