I am having problems accessing a rest api of one of my suppliers and he continues to ask me to send him the payload of the message I am sending and the one I am receiving. How can I get these payloads in postman?
Hey @SAMMUT 
Welcome to the Postman Community! 
Without more contextual information and details about the API you’re using, the payloads and anything else that’s relevant - it’s going to be difficult to help you here. 
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He is asking you for the request payload and response payload of the API requests you’re making.
The request payload is the data YOU are sending to the API. The response payload is that data the API sends back to you.
If you are sending a GET request, you likely don’t have a payload, at least not in the body of the request. You might have data in headers or path/query parameters. I agree with @danny-dainton, without more context it’s difficult to tell you exactly what to look for.
But in general, take a look at the screenshot of Postman below from an example request I made 
Typically your request payload will be in the top half and the response payload will be in the bottom half after you send the request.
Hope this helps!
You can also check out the Postman Docs for sending a request, which might help you understand the layout a bit more 