The simplest option to set parameters for BAS is any analog of contact form for wordpress.
From the site side, you set the necessary settings or parameters, and send an email to your email
From the BAS side, running best on VDS, you scan emails from a certain mailbox, for example by imap. And you execute the commands you have already received in BAS, after which you send the result of the work to a letter, or create a page on the site with the necessary data.
You can also use mysql as communication elements, on the one hand filling in the table, on the other hand reading data from it and executing the set commands.
Please note that this text was translated using Yandex translator.