In the doc https://support.google.com/drive/answer/3093340?hl=en it's 
written

>
>    - In the new version of Google 
> Sheets<https://support.google.com/drive/answer/3541068>, 
>    the first time Spreadsheet B pulls data from Spreadsheet A, the person 
>    inserting the IMPORTRANGE will be asked to grant Spreadsheet B access 
>    to that data. Once access is granted, all other viewers and editors of 
>    Spreadsheet B will have access to the data being referenced by 
>    IMPORTRANGE.
>
> Should we grant access via the API ? in that case how ? 
Thanks

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