We're trying to set up a Zapier integration to pull order data (specifically a custom Order Info field, "Referral Reasons") via the ISN REST API, using our Access Key and Secret Access Key.

Endpoint tested: https://goisn.net/sunbeltinspections/rest/order/{id}, and also the simpler https://goisn.net/sunbeltinspections/rest/me

Auth method: Basic Auth (Access Key as username, Secret Access Key as password), tested via both Zapier's native Basic Auth field and a manually base64-encoded Authorization header - same result both times.

Error received on every attempt, including the simple /rest/me endpoint: "You must login to use this service (username received: '' - password had 0 characters)"

This suggests the credentials aren't reaching ISN's auth layer at all when sent via Zapier's Webhooks step, even though the request structure matches your documented example (https://[domain]/[company]/rest/...) exactly.

Could your Development team confirm whether ISN's API currently supports authentication from tools like Zapier, or advise on the correct request format?

Company key: sunbeltinspections