Install the module. To do this, copy the contents of the Unitpay directory from the archive to the address <folder with your site>/sites/all/modules. After that, click Modules in the menu, check the box next to Unitpay and click Save сonfiguration.
Then go to Store -> Configure store -> Payment methods -> edit Unitpay and click the Edit button opposite the Enable payment method: Unitpay. In the DOMAIN field, insert the value of unitpay.money and copy the public and secret key from the Unitpay account in the PUBLIC KEY and SECRET KEY fields.