script.js

async function setFormDataJob(source, data, token, clientId) {

	let body = {
		'assetID': source.assetID,
		'jsonFormFieldsData':data
	}

	let resp = await fetch('https://pdf-services-ue1.adobe.io/operation/setformdata', {
		method: 'POST', 
		headers: {
			'Authorization':`Bearer ${token}`, 
			'X-API-KEY':clientId,
			'Content-Type':'application/json'
		},
		body:JSON.stringify(body)
	});

	return resp.headers.get('location');

}