Plugin configuration should only be done after step 6 of installation.
To successfully configure the plugin, you need to take some steps.
If you are currently in the module settings window (for example, if you followed the installation instructions, and reached step 6), you can skip the first few steps, right down to the actual configuration steps.
In the module settings, set the values of the merchant ID and the secret key. If you do not know how to get this data, use the instructions.
Set the correct currency (matching the currency specified on your website).
Set the country code - RU (regardless of the real country - this is a forced measure due to problems with the universal template inside Tilda).
Be sure to set the URL of the success page (the page that will open for the client after a successful payment), and the URL of the refusal page (will open after an error during payment). The URLs themselves are not essential, the main thing is that they are real.
It's also possible, if necessary, to change the title of the payment system.
Click on the “Save” button (or “Add” if you have not completed step 8 of the installation). Make sure that the data has been saved.