Do you run multistore website? maybe one of your multistore website is addressed to one or another country? or maybe all your multistore websites are addressing different countries? one website for UK, another for USA customers? or maybe you have a partner and one multistore belongs to you and another one to your partner?
No matter what, i do believe you already had the issue when you wanted to set up different paypal accounts to be used on separate multistores... I believe you already wanted to collect payments from your multistores to a different paypal accounts. But Opencart paypal integration didn't allowed you to do that...
This extension eliminates this limitation and expands paypal payment integration to a new level. This extension will allow you to add separate paypal accounts per store, that is you can set each multistore to collect paypal payments to different paypal accounts.
Once you add new multistore to your system settings, new email input will appear in paypal setup page in your paypal payment settings.
So once your customers will be checking out at your stores, they will be paying to the paypal accounts, the ones you set up for the store where the customer is checking out.