About cash payments

Hello again everyone, does anyone use the plugin with cash payments successfully? In my case, the plugin works with the PayPal plugin and with card stripe, but I am testing the cash payment gateway (I have completed the orders manually) and the registration link is generated with the administrator data. That error is common if the downloadable box is not activated, or if the tests are performed from a browser that we are connected to in moodle, however, in my case I do the tests from a different browser with a clean history. So I have that question, if I make the payment in cash and the plugin completes the order when woocommerce detects the payment, will the link work? I repeat that for now I make the order but I do not make the real payment, I manually make the change to completed. Has anyone been through this situation? What is the email address of the plugin developer? I think I have a couple of observations that may be helpful.