`write_checkouts` permissions not available in admin view

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When making a post request to this end point '<store_domain>/admin/checkouts.json', the result is the following - 

    "errors""[API] This action requires merchant approval for write_checkouts scope."
However, when viewing permissions in the admin view for the private app I am using, there are no 'write_checkouts' permissions listed under admin API permissions. 
Instead the only place for 'checkouts' related permissions are via the storefront API, which is a separate endpoint / different functionality. 
In short: Is there a place to modify the `write_checkouts` permission for a private app / where is this setting?