Record Creation between Two Different Organization

Hello Guys,

This is one of my client question and requirement. They are having two Organization (say Org A and Org B)

both are 2015 online version only

If they create any record in Account entity in Org A, they same record must be created in Org B (in account entity)

They want to implement in Web API JavaScript (else if any other way is there just give me a hint) , if there is no possible way give me reason

Help me to get through this problem

According to my knowledge we can't do the above requirements, because Each ORG has different DB and you can't communicate with one another

Thanks in advance