Hi Greg, another questions by the way,

1. when I set the client's scope by "read%20write%20chat", and then check its scope by "

curl https://www.zopim.com/api/v2/oauth/clients

", the result shows my client's scopes are "read write", there is no "chat". Does this because my Zendesk chat plan is "basic", not "Enterprise or Premium (legacy) plan"? As I can see that "The Conversations API is available on Zendesk Chat Enterprise or Premium (legacy) plan.", your engineers do the access control when the client is authenticated.

2. I checked my Zendesk plan and the chat is 'Basic'. When I plan to upgrade my Zendesk plan to ENTERPRISE，I found that there is no 'basic' plan in Chat? Is this an old version? After I finished to upgrade to ENTERPRISE plan which cost $70/month, will I be able to set the scope with 'chat' and use the chat conversational API?