We need following workflow. Every year we have to create new contract template that our users have to sign. Template has client specific values in the text (fields in terms of Word document). When user activates signing in our application (Ruby on Rails) we have to fill in these values from our database and then open it in an iframe so client can sign it. Upon opening filled in values must not be changed by the client so only signature field is the one to be filled in.
I was browsing and searching through the documentation for last couple days and cannot find a way to implement this. Can you, please, tell me if this is possible and if it is what is exact procedure (from creating template with fields that we can fill in but client cannot change) till signing such document?