First, get connected on your IPX and go to the setting page.
Then go to the ApiKey page.
If you don't have any Api Key created click on the "Add" button.
Copy the Apykey content field.
Now that we have the Api key we can go on postman. Download it
Paste your Api Key in Params, Query Params, ApiKey.
See the dowload page.
Go to the start page of the collection. Then go to the variables panel and paste the IPX adress in the current value field.
Get on api/system/ipx and click on the "SEND" button.
Put on api/system/ipx, go to the body part and chose raw format. Then add the field you want to change (here the last relay) and click on the "SEND" button.
We can see the relay in the response body.