We are looking at the following scenario. We sell software. We have situations where we need to handle particular sales manually.  A licence needs to be generated and we have a restful api that enables us to do that.

In the manual situation when the invoice is created in books we would already have received payment. Ideally, as the invoice is generated we would wish to make a call to our licence api and some how get presented with a draft email to our customer containing their licence details.  So we can call our restful api to generate the licencefrom a workflow I guess,  but is there a way to get back the results of that call into a form which automatically opens &  shows a draft text of an email which we can amend and/or send as necessary?  Something involving Creator?

I look forward to your thoughts.