Creates your app’s refresh token and an initial access token.
Important: This endpoint is relevant for advanced OAuth only. It isn’t relevant for basic OAuth.
Wix sends your app the authorization code after a new user has completed the installation process and given your app permission to access their data.
You must pass the authorization code, your app ID, your app’s secret key, and {“grant_type”: “authorization_code”} to create the refresh token and an initial access token.