The 22nd of January, I received an email with the subject \'Important: Steps to migrate from discontinued Documents List API\' from Google Apps .
Imp
The official Google response is that the Spreadsheets API will continue to function after the 20 April shutdown:
"Apologies for the confusing email. The sheets API is not yet deprecated and will continue to operate beyond the April shutdowns."
https://code.google.com/a/google.com/p/apps-api-issues/issues/detail?id=3709