Following is an example of how to list every certificate in an API Gateway using curl.

curl --request GET --user "john.doe:itsasecret" --url "https://apig.example.com:8443/restman/1.0/trustedCertificates"

Or, you can return a single certificate by including the ID of the certificate

curl --request GET --user "john.doe:itsasecret" --url "https://apig.example.com:8443/restman/1.0/trustedCertificates/fa003c1f2478cc407b0a8acbba2aa199"

Or you can see if there is a certificate with a certain name. Be aware that if there is white space in the certificate name, %20 will be needed for each white space.

curl --request GET --user "john.doe:itsasecret" --url "https://apig.example.com:8443/restman/1.0/trustedCertificates?name=foo%20certificate"

Here is an example of the output that should be returned.

<l7:List>
    <l7:Item>
        <l7:Name>Foo Bar CA</l7:Name>
        <l7:Id>fa003c1f2478cc407b0a8acbba2aa199</l7:Id>
        <l7:Type>TRUSTED_CERT</l7:Type>
        <l7:TimeStamp>2020-05-28T00:53:39.838-05:00</l7:TimeStamp>
        <l7:Link rel="self" uri="https://example.com:8443/restman/1.0/trustedCertificates/fa003c1f2478cc407b0a8acbba2aa199"/>
        <l7:Resource>
            <l7:TrustedCertificate id="fa003c1f2478cc407b0a8acbba2aa199" version="3">
                <l7:Name>Foo Bar CA</l7:Name>
                <l7:CertificateData>
                    <l7:IssuerName>CN%3DVeriSign+Class+3+Public+Primary+Certification+Authority+-+G5%2COU%3D%28c%29+2006+VeriSign%5C%2C+Inc.+-+For+authorized+use+only%2COU%3DVeriSign+Trust+Network%2CO%3DVeriSign%5C%2C+Inc.%2CC%3DUS</l7:IssuerName>
                    <l7:SerialNumber>109878343814372231238216740661118760447</l7:SerialNumber>
                    <l7:SubjectName>CN%3DFoo+Bar+CA</l7:SubjectName>
                    <l7:Encoded>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</l7:Encoded>
                </l7:CertificateData>
                <l7:Properties>
                    <l7:Property key="revocationCheckingEnabled">
                        <l7:BooleanValue>true</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustAnchor">
                        <l7:BooleanValue>true</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustedAsSamlAttestingEntity">
                        <l7:BooleanValue>false</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustedAsSamlIssuer">
                        <l7:BooleanValue>false</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustedForSigningClientCerts">
                        <l7:BooleanValue>false</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustedForSigningServerCerts">
                        <l7:BooleanValue>true</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="trustedForSsl">
                        <l7:BooleanValue>false</l7:BooleanValue>
                    </l7:Property>
                    <l7:Property key="verifyHostname">
                        <l7:BooleanValue>false</l7:BooleanValue>
                    </l7:Property>
                </l7:Properties>
            </l7:TrustedCertificate>
        </l7:Resource>
    </l7:Item>
</l7:List>