Hi there.
you should add the ‘X-RapidAPI-Key’ and ‘X-RapidAPI-Host’ as the required parameters in your header.
you can use the postman application to send http requests and simply add the header.

headers: {
‘X-RapidAPI-Key’: ‘59b5eba722mshb2410788b56bec4p1bb8c0jsnff26a12d291b’,
‘X-RapidAPI-Host’: ‘vaccovid-coronavirus-vaccine-and-treatment-tracker.p.rapidapi.com’
}