I have the same error : cURL error 60: SSL certificate problem: unable to get local issuer certificate (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)
I have added the following to my php.ini file :
; A default value for the CURLOPT_CAINFO option. This is required to be an
; absolute path.
;curl.cainfo = "C:\Program Files\iis express\PHP\v8.0\extras\ssl\cacert.pem"
and restarted IIS, but it still gives me the error