Combine Applications

Combine Applications

Hello!

I have searched for my problem but haven't find anything.
So...
I have two applications for my two companies. For managing payments there is a money form (fields as: date, account, purpose, amount etc.) in each application.

I have third main application where I want to put all the combined data collected from these two applications into one form/table.

Please, need your advise - how it is better to be developed. I have no ideas.
I've tried direct links as: 

insert into application2.form_name
[
Amount = input.amount
];

But it doesn't worked across applications.