Getting the instance-id

Hi.
Many thanks for this code.

I am trying to get the 9 digits instance-id (in _italics_ below) of a form using the API R code, in order to complete the following url, which allows editions after submission:

https://ona.io/[username]/[project id - 6 digits]/[form id - 6 digits]/webform?instance-id=[_9 digits_]

Is that foreseen or easy to do?

Thanks,

Xavier