Opencart 2.0 shared cart extension

Hello,
I am working now at a opencart based website with multi store feature involved.
I started with one installation, I created an addon domain and added a new store from the admin. All works (I can use categories and products from one store to another, the users are shared) with only one exception: The CART!
Let`s say that i have a domain1.com witch is the default store and other domain2.com, domain3.com etc...
I want to be able to add to cart a product on the domain1.com and then move to domain2.com and have that item in the cart.
Is there any solution for my problem? Have someone already developed an extension that could save me? If not, does anybody want do to so? if yes please respond on this post.

Thank you very much!

In OC 2 settings, try enabling 'shared sessions'. That may work.