SSL certificate verify result: unable to get local issuer certificate (20)

I combined both SSL certificates and then uploaded that on heroku. Command to combine both SSL certificate is:

cat certificate.crt gd_bundle.crt > combine.crt

It will combine certificate.crt and gd_bundle.crt to create combine.crt

You need to tell curl the location of your trusted root certificate store. Try:

curl -vI --cacert /etc/ssl/cert.pem

curl -vI --capath /etc/ssl/certs/

(The exact path to your system trusted root store varies by OS/distro, so it may not be exactly one of the above.)

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