OAuth Error - {"error":"invalid_code"}

OAuth Error - {"error":"invalid_code"}


curl -v --ipv4 -X GET \



Entered the response URL into a browser. 
Selected 'Accept' button

Get redirected to my real zoho callback url-

Use the grant token in the following POST -
curl -v --ipv4 -X POST \

Response:
{"error":"invalid_code"}


I'm surely misinterpreting the instructions. Is it clear to anyone?

Thank you,
Ted S