Webhook Automation - wanting to pass some variables to an Integromat Webhook

Beginning help needed with writing a script using a Webhook with Integromat. The first part of the script I’ve got, taking that from other community posts:

let url = "https://hook.integromat.com/xxxxxxxxxxxxxxx?updateInfo=";
let inputConfig = input.config();

And Airtable allows for creation of input variables, which I’ve got three:


So there needs to be one more line in the script, which spends the variables to the webhook URL - but I don’t know how to write that code. I think it begins like this…

await fetch(url + config.updateInfo

What comes after that?