Hai, i try to get access token form OAuth process via API. So, i now using access token URL to get the access token. But, it's not work.I explain clearly:1) First i am authorise retyaboard app using authorisation URL. I make the API call, it's provide code.2) Then i make the access token request using access token URL and previous step code (authorisation code).But, i this step provide error.Access token URL: URL: https://board.demo.restya.com/api/v1/oauth/token.json?code=XXXXXXXXXXXXXXX&redirect_uri=https://flow.zoho.com/oAuth/callBack&state=YYYYYYYYYYYI hope it's clear now. Just remember i use the demo account not paid account.
Unfortunately it is still not clear what exactly you're doing with the API and Zoho Flow. Perhaps you're connecting another software through Zoho Flow? If so, are you passing any other value from that software too?
Also, refer to the API document at https://board.demo.restya.com/api_explorer/ and use the correct request methods (GET vs POST vs PUT).