What error are you experiencing? Can you share a screenshot of what is going wrong? You’re showing code and a network history (presumably from running this code in some other context?) but not what Zapier is complaining about. If you share that, we might be abel to help faster! 

Sorry, here is the Zapier test output:
 

The network traffic picture was from the developer tools network tab opened up on the Zapier page while I ran the test. You can see here that I am getting 0 errors (which is consistent with the successful network traffic) but only the first two console.log statements are printing (and do demonstrate the POST body contains the correct information in the correct format), and the returned JSON is not being picked up by the script.

Cool! Thank you for the clarificatino. My next question is whether we can insert a couple of simple console.logs -even without variables - right at the top of the catch block and after you completed the fetch but before you get the JSON. I’m wondering if we take it step by step, we can dial in on where the thing isn’t working right. I don’t see an obvious candidate for what’s wrong, so I try to let the code tell me. 

Revised code: Added empty console.log() at top of catch block and in try() after the fetch() and let obj = …

:
console.log("start");
const uuid = inputData.uuid;
const sec = inputData.secret;
const base = 'https://secure.actblue.com/api/v1/csvs/';
const sdate = inputData.startdate;
const edate = inputData.endate;
const authHeader = 'Basic ' + Buffer.from(`${uuid}:${sec}`).toString('base64');
const body = JSON.stringify({
'csv_type': 'paid_contributions',
'date_range_start': `${sdate}`,
'date_range_end': `${edate}` });
console.log(body);
output = {id: "no data"};
async function getID() {
   try {
      const response = await fetch(`${base}`, {
         method: 'POST',
         headers: {
            'Authorization': authHeader,
            'Accept': 'application/json',
            'Content-Type': 'application/json' },
         body: body });
   console.log();
   let obj = await response.json();
   console.log();
   console.log(obj);
   output = {id: obj};
   callback(null, obj);
   } catch (error) {
      console.log();
      console.error(error);
      callback(error); }
   }
getID();

 

Seems that its breaking down after the fetch() and skipping everything else?

Now i think I see the problem. It’s not waiting for your answer. at the bottom, use the await keyword:

await getID();

Thank you!! Sometimes its the little things that you can miss so easily! I didnt think about the function call, as I had used await on the internal steps! Onward and upward!