-d "grant_type=client_credentials" \
  "http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token"
```

The result will be a JSON document. To invoke the API you need to extract the value of the access_token property. You can then invoke the API by including the value in the Authorization header of requests to the API.

The following example shows how to get the details of the user with `{userid}` from `{realm}` realm:

```

| Params     | Value    |
| :--        | :--      |
| *Type*     | *String* |
| *Required* | *No*     |

### RoleArn

    //                                                                       =============
    @Override
    public String asTableDbName() {
        return "access_token";
    }

    @Override
    public String xgetAliasName() {
        return "access_token";
    }

    // ===================================================================================

import java.util.Arrays;
import java.util.Date;

import org.codelibs.fess.opensearch.config.bsentity.BsAccessToken;

/**
 * @author ESFlute (using FreeGen)
 */
public class AccessToken extends BsAccessToken {

    private static final long serialVersionUID = 1L;

    public String getId() {
        return asDocMeta().id();
    }

    public void setId(final String id) {

     * @return The access token.
     */
    public OptionalEntity<AccessToken> getAccessToken(final String id) {
        return accessTokenBhv.selectByPK(id);
    }

    /**
     * Store the access token.
     * @param accessToken The access token.
     */
    public void store(final AccessToken accessToken) {

        accessTokenBhv.insertOrUpdate(accessToken, op -> op.setRefreshPolicy(Constants.TRUE));

    }

    /**

    }

    /**
     * Creates an EditBody from an AccessToken entity for API responses.
     * Converts permissions and handles date formatting.
     *
     * @param entity the AccessToken entity to convert
     * @return the EditBody representation of the entity
     */
    protected EditBody createEditBody(final AccessToken entity) {
        final EditBody body = new EditBody();

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.accesstoken;

import org.codelibs.fess.app.web.admin.accesstoken.CreateForm;

/**
 * Request body for creating access token via REST API.
 * Extends CreateForm to inherit validation and field definitions.
 */
public class CreateBody extends CreateForm {

    <jsp:include page="/WEB-INF/view/common/admin/sidebar.jsp">
        <jsp:param name="menuCategoryType" value="system"/>
        <jsp:param name="menuType" value="accessToken"/>
    </jsp:include>
    <main class="content-wrapper">
        <div class="content-header">
            <div class="container-fluid">
                <div class="row mb-2">
                    <div class="col-sm-6">

    //                                                                        ============

    private static OptionalEntity<AccessToken> getEntity(final CreateForm form, final String username, final long currentTime) {
        switch (form.crudMode) {
        case CrudMode.CREATE:
            return OptionalEntity.of(new AccessToken()).map(entity -> {
                entity.setCreatedBy(username);
                entity.setCreatedTime(currentTime);

 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.api.admin.accesstoken;

import org.codelibs.fess.app.web.admin.accesstoken.EditForm;

/**
 * Request body class for access token edit operations in the admin REST API.
 * This class extends EditForm to inherit the necessary form validation and binding capabilities