Hello Again,   We have started to integrate V3  API.  We have completed following step.   1. Generate CODE - To recreate case, I am providing detail here. Using the following URL, You can generate the code. https://authz.constantcontact.com/oauth2/default/v1/authorize?client_id=ec179f3f-5e8e-454c-a015-ec35ab0bce53&scope=+offline_access&response_type=code&state=qwerty&redirect_uri=https://caasafety.com.au/ 2. Generating token - Using CODE we are getting using above URL we are trying to generate access token. Following detail, we have used for that. : https://prnt.sc/fHNkDgHFIbU0 You can check the error we are getting. So we need help to move forward from here. https://authz.constantcontact.com/oauth2/default/v1/token Parameter :  code: [Take latest from Generate CODE URL] redirect_uri:https://caasafety.com.au/ grant_type:authorization_code client_id:ec179f3f-5e8e-454c-a015-ec35ab0bce53 Could you please guide us what is wrong here? ... View more

We are getting following email. Check following screenshot :  https://prnt.sc/DY2E6epdkrT1   Now we have the following type of code in our website: https://prnt.sc/yYtVld75ksQp   So we are not sure about how we need to update the authentication process. We have read the documentation, but not getting clear way to do.  Still we have made the change in code which is following, but it is not working at our end. Screenshot : https://prnt.sc/f1D93dz0ejz_   Could you please have a look and help us to upgrade   ... View more