OC 2.1.0.1 - Shared basket across subdomains

Hello everyone,
I have a problem I have been dealing with for a couple of days.

I am using opencart 2.1.0.1 with multistore.
Default store is located at mydomain.com but only consists of one page from which users go to actual stores. So users dont put anyhting in the basket here, nor make registration or login.
Then I have 2 stores located in subdomains, store1.mydomain.com and store2.mydomain.com.
Each of these 3 stores has a different template.
Products are not shared across stores. So each product can be found only on one of those 2 stores.

If a user puts something in the basket on store1.mydomain.com and then goes to store2.mydomain.com his basket is empty. When he goes back to store1.mydomain.com he has original product in the basket.
Also if a user logs in on store1.mydomain.com and goes to store2.mydomain.com he needs to log in again.

I need to have shared basket and user login, so when a user puts something in a basket on one store and then goes to second he can see everything in one basket.

If you are interested, please pm me here. Also it would be great if you could estimate time and price of this work. Contact email for faster communication would be also appreciated.

Best regards.

Hi,

You can reach me on Skype: cisin.arnold or Email: arnold.cis20@gmail.com so that we can discuss this further.

Arnold

Greetings !

I have sent you PM

Regards,
Thomas J