**To get a list of client certificates** Command:: aws apigateway get-client-certificates Output:: { "items": [ { "pemEncodedCertificate": "-----BEGIN CERTIFICATE----- <certificate content> -----END CERTIFICATE-----", "clientCertificateId": "a1b2c3", "expirationDate": 1483556561, "description": "My Client Certificate", "createdDate": 1452020561 } ] }