How to pass something to an existing PHP file

@nevil Did this work for you?

I eventually achieved the same by using an API action to that PHP file. My programmer then would catch that API call (with the variables in that call) and then would execute the PHP file like I wanted (see first post in this topic).

The PHP file has some built in security to mitigate the less secure method of API calling a public PHP file. It’s a bit of a crude workaround, but it works.