POST /acme/cert/mAt3xBGaobw HTTP/1.1
Host: example.com
Content-Type: application/jose+json
Accept: application/pem-certificate-chain

{
    "protected": base64url({
        "alg": "ES256",
        "kid": "https://example.com/acme/acct/evOfKhNU60wg",
        "nonce": "uQpSjlRb4vQVCjVYAyyUWg",
        "url": "https://example.com/acme/cert/mAt3xBGaobw"
    }),
    "payload": "",
    "signature": "nuSDISbWG8mMgE7H...QyVUL68yzf3Zawps"
}

HTTP/1.1 200 OK
Content-Type: application/pem-certificate-chain
Link: <https://example.com/acme/directory>;rel="index"

-----BEGIN CERTIFICATE-----
[End-entity certificate contents]
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
[Issuer certificate contents]
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
[Other certificate contents]
-----END CERTIFICATE-----