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<a href="authentication.html">Authentication</a>
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<a href="registeredService.html">Registered Services</a>
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<span>Advanced</span>
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<a href="#">Authentication</a>
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<li><a href="./authentication.html">General Information</a></li>
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<li><a href="./personalToken.html">Personal Token</a></li>
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<li><a href="./registeredService.html">Registered Services</a>
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<li><a href="./basic.html">Basic</a></li>
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<h2 id="service" class="uk-text-center">Advanced service authentication and registration</h2>
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<p>For the <b>Advanced Authentication</b> method your service does not send a client secret but it uses a <em>self signed
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client assertion</em> to obtain the access token for the OpenAIRE APIs. The client assertion is a JWT that must be
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signed with RSASSA using SHA-256 hash algorithm. The OpenAIRE AAI server validates the client assertion using the public
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key that you have provided upon the service registration.
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</p>
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<h4>Prepare to register your service</h4>
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<p>Before you register your service you need to prepare a pair of a private key and a public key on your side.
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<div class="uk-alert-primary" uk-alert>
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We accept keys signed with RSASSA using SHA-256 hash algorithm.
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To create the key pair you have the following options:
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<ul class="portal-circle">
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<li>Use OpenAIRE authorization server built in tool. You can access the service here:
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<a href="https://aai.openaire.eu/oidc/generate-oidc-keystore" target="_blank">https://aai.openaire.eu/oidc/generate-oidc-keystore</a>.
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<br>
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The response is your <span class="uk-text-primary"><b>Public and Private Keypair</b></span> and has the following format:
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<pre class="uk-text-left">
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{
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"p" : ...,
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"kty" : "RSA",
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"q" : ...,
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"d" : ...,
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"e" : "AQAB",
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"kid" : ...,
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"qi" : ...,
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"dp" : ...,
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"alg" : "RS256",
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"dq" : ...,
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"n" : ....
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}</pre>
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Use the public key parameters (kty, e, kid, alg, n) to create your <span class="uk-text-primary"><b>Public Key</b></span>
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in the following format:
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<pre class="uk-text-left">
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{
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"kty": "RSA",
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"e": "AQAB",
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"kid": ...,
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"alg": "RS256",
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"n": ...
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}</pre>
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<div class="uk-alert-primary" uk-alert>
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Store both the <span class="uk-text-primary"><b>Public and Private keypair</b></span> and the <span class="uk-text-primary"><b>Public key</b></span>. You will need them to register your service.
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</div>
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<div class="uk-alert-danger" uk-alert>
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Store the <span class="uk-text-primary"><b>Public and Private keypair</b></span> confidentially on the service side.
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</div>
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</li>
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<li>
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Use openssl and then convert the keys to jwk format using PEM to JWK scripts, such as <a href="https://github.com/danedmunds/pem-to-jwk" target="_blank">https://github.com/danedmunds/pem-to-jwk</a>.
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Alternatively, the client application can read the key pair in PEM format and then convert them, using JWK libraries.
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Use the public key parameters (kty, e, kid, alg, n) to the service registration.
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</li>
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</ul>
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<div class="uk-alert-primary" uk-alert>
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You can also provide a public key in JWK format that can be accessed using a link.
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</div>
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</p>
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<h4>How to register your service</h4>
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<p>To register your service you need to:</p>
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<ol>
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<li>Login to OpenAIRE. In case you are not already a member you will need to register first.</li>
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<li>Go to your <a href="https://services.openaire.eu/uoa-user-management/registeredServices" target="_blank">Registered Services</a> page and click the New Service button.</li>
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<li>Provide the <span class="uk-text-primary"><b>"Νame"</b></span> (mandatory) of your service.</li>
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<li>Select the Advanced <span class="uk-text-primary"><b>"Security level"</b></span></li>
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<li>Use the public key parameters (kty, e, kid, alg, n) you previously produced to
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declare your <span class="uk-text-primary"><b>"Public Key"</b></span> <span class="uk-text-primary"><b>"By value"</b></span>
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in the following format:
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<pre>
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{
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"kty": "RSA",
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"e": "AQAB",
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"kid": ...,
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"alg": "RS256",
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"n": ...
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}</pre>
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<b>- OR -</b>
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<p>If your service has a public key in JWK format that can be accessed using a link, you can set <span class="uk-text-primary"><b>“Public Key”</b></span> to <span class="uk-text-primary"><b>“By URL”</b></span>.</p>
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</b>
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<li>Click the <span class="uk-text-primary"><b>Add New Service</b></span> button.</li>
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</ol>
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<p>Once your service is created it will appear in the list of your <a href="https://services.openaire.eu/uoa-user-management/registeredServices" target="_blank">Registered Services</a> page, with
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the <b>Service Id</b> that was automatically assigned to it by the AAI OpenAIRE service.</p>
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<h4>How to make a request</h4>
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<h5><span class="uk-text-bold">Step 1.</span> Create and sign a JWT</h5>
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<p>Your service must create and sign a JWT and include it in the request to token endpoint as
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described in the <a href="https://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication" target="_blank">OpenID Connect Core 1.0, 9. Client Authentication</a>.
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</p>
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<p>
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<p>To create a JWT you can use <a href="https://mkjose.org/" target="_blank">https://mkjose.org/</a>. To do so you need to create a <b>payload</b> that should contain the following claims:</p>
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<pre class="uk-text-left">
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{
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"iss": "{SERVICE_ID}",
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"sub": "{SERVICE_ID}",
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"aud": "https://aai.openaire.eu/oidc/token",
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"jti": "{RANDOM_STRING}",
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"exp": {EXPIRATION_TIME_OF_SIGNED_JWT}
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}</pre>
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<ul>
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<li><b>iss</b>, <em>(required)</em> the “issuer” claim identifies the principal that issued the JWT. The value is
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the <b>Service Id</b> that was created when you registered your service.
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</li>
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<li><b>sub</b>, <em>(required)</em> the “subject” claim identifies the principal that is the subject of the JWT.
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The value is the <b>Service Id</b> that was created when you registered your service.</li>
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<li>aud, <em>(required)</em> the “audience” claim identifies the recipients that the JWT is intended for.
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The value is <b>https://aai.openaire.eu/oidc/token</b>>.</li>
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<li><b>jti</b>, <em>(required)</em> The “JWT ID” claim provides a unique identifier for the JWT.
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The value is a random string.</li>
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<li><b>exp</b>, <em>(required)</em> the “expiration time” claim identifies the expiration time on or after which the
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JWT <b>MUST NOT</b> be accepted for processing.
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The value is a timestamp in <b>epoch format</b>.</li>
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</ul>
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<p>
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Fill in the payload in the form available at <a href="https://mkjose.org/" target="_blank">https://mkjose.org/</a>, select the
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Signing Algorithm to be <b>RS256 using SHA-256</b> and paste the <span class="uk-text-primary"><b>Public and Private Keypair</b></span>
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previously created.
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</p>
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<p>To check your JWT you can go to <a href="https://jwt.io/" target="_blank">https://jwt.io/</a>. The
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<b>header</b> should contain the following claims:</p>
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<pre class="uk-text-left">
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{
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"alg": "RS256",
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"kid": ...
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}</pre>
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where <b>kid</b> is the one of your <span class="uk-text-primary"><b>Public and Private Keypair</b></span> you used to sign the JWT in <span class="uk-text-primary"><b>Step 1</b></span>.</li>
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</ul>
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</p>
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</p>
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<div class="uk-alert-danger" uk-alert>
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Store the signed key confidentially on the service side. You will need it in Step 2.
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</div>
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<h5><span class="uk-text-bold">Step 2.</span> Request for an access token</h5>
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<p>
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To make an access token request use the <em>signed JWT</em> that you created in <span class="uk-text-primary"><b>Step 1</b></span>.
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The OpenAIRE AAI server will check if the signed JWT is valid using the public key that you
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declared in the <span class="uk-text-primary"><b>"How to register your service"</b></span>
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process.
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<pre class="uk-text-left">
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curl -k -X POST "https://aai.openaire.eu/oidc/token" \
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-d "grant_type=client_credentials" \
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-d "client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer" \
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-d "client_assertion={signedJWT}"</pre>
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<p>where <b>{signedJWT}</b> is the signed JWT created in <span class="uk-text-primary"><b>Step 1</b></span>.</p>
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<p>
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The response is:
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<pre class="uk-text-left">
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{
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"access_token": {ACCESS_TOKEN}
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"token_type":"Bearer",
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"expires_in": ...,
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"scope":"openid"
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}</pre>
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</p>
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</p>
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<div class="uk-alert-danger" uk-alert>
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<p>Store the access token confidentially on the service side.</p>
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</div>
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<h5><span class="uk-text-bold">Step 3.</span> Make a request</h5>
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<p>To access the OpenAIRE APIs send the access token returned in <span class="uk-text-primary"><b>Step 2</b></span>.</p>
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<pre class="uk-text-left">
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GET https://test.openaire.eu/{resourceServicePath}
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Authorization: Bearer {ACCESS_TOKEN}</pre>
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<h4>Error messages</h4>
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<p>401 - Invalid client assertion</p>
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{
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<p>401 - Client assertion for missing service</p>
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{
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<p>401 - Expired signed jwt</p>
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{
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</a> Unless otherwise indicated, all materials created by OpenAIRE are licenced under
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CC ATTRIBUTION 4.0 INTERNATIONAL LICENSE
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