To run the API from STEL Order you have to follow these steps:
.From your profile > Features > API, click on "New". Then type a name for the API key, select employee and click on Save. Then open the browser, type in the search bar the following address that contains the API information https://app.stelorder.com/app/indexapi.html
.Once this is done, go back to STEL Order, click on the generated API key and click on copy in link, with this link you will access again to the API link, click on the "Authorize", paste the copied information in the "Value" section and click on "Authorize", from here you can execute any action.