In general, use
oadoi_fetch instead. It calls this
method, returning open access status information from all your requests.
character vector,a DOI
character vector, mandatory!
Unpaywall requires your email address,
so that they can track usage and notify you when something breaks.
Set email address in your '.Renviron' file with
1 2 3 4
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.