Creating a post request in Google App Script

[nockmago]

hey everybody! I'm struggling like crazy with a post request I'm trying to make from an airtable script

here is what I am trying to do:

1. From Airtable scripting, create an object that contains record data. DONE
2. Send that object through a post request to Google Apps Script. STRUGGLING
3. Read the data from google app scripts and use it to fill a template. NOT DONE YET

The reason why I am using this approach instead of pre-built Google Doc filling templates is because my data is complex and I need flexibility.

Here is the final part of the Airtable code:

let response = await remoteFetchAsync(url, {
    method: 'POST',
    body: JSON.stringify(getFacility(record)),
    headers: {
        'Content-Type': 'application/json',
        'Accept': 'application/json',
    },
});

By logging the response, I get 401 unauthorised. Although, I am not sure what do I need to authorise, nor how. I could not find much information about this use case online. Any ideas? Thank you so much!!