I am trying to make a connection to zoho writer so that i can have a custom function make a merge document when a deal is created in zoho crm.

I followed all of the steps here for setting up oauth 2 for the authorization.

I managed to do all of that without issue.

But I do not understand how to add this as a connection to zoho crm now that I have these tokens.

In the connections setup i went to create connection > custom services > create new service.

I switched authentication type from api key to oauth2.

That is as far as I got. I don't know what to put into the authorize url, access token url, and refresh token url fields. I tried a few different things and got errors from all of them. 

What do i put in these fields? I do have my refresh and access token i just dont know what to do with them

Any help would be very much appreciated!!

Thanks in advance!

ps. it seems strange that there is a built in connection with workdrive but not with the merge templates. Is there a built in connection and I am just missing it? Either way I would like to know how to do this for other things that don't have a built in connection