diff --git a/docs/integrations/harness/locations.md b/docs/integrations/harness/locations.md
index 8911d7918c..a3d0e2cfd4 100644
--- a/docs/integrations/harness/locations.md
+++ b/docs/integrations/harness/locations.md
@@ -20,14 +20,14 @@ integrations:
   harness:
     - host: app.harness.io
       token: ${HARNESS_CODE_BEARER_TOKEN}
+      apiKey: ${HARNESS_CODE_APIKEY}
 ```
 
-Directly under the `harnessCode` key is a list of provider configurations, where you
-can list the Gitea instances you want to be able to fetch
-data from. Each entry is a structure with up to four elements:
+Directly under the `harness` key is a list of provider configurations, where you
+can list the Harness instances you want to be able to fetch
+
+check out https://developer.harness.io/docs/platform/automation/api/add-and-manage-api-keys/ for more information
 
 - `host`: The host of the Harness Code instance that you want to match on.
-- `baseUrl` (optional): Needed if the Harness Code instance is not reachable at
-  the base of the `host` option (e.g. `https://app.harness.io`). This is the address that you would open in a browser.
-- `username` (optional): The gitea username to use in API requests.
 - `token` (optional): The password or api token to authenticate with.
+- `apiKey` (optional): The apiKey to authenticate with.
diff --git a/packages/backend-common/src/reading/HarnessUrlReader.ts b/packages/backend-common/src/reading/HarnessUrlReader.ts
index fd01e4f8a2..95114ae9d6 100644
--- a/packages/backend-common/src/reading/HarnessUrlReader.ts
+++ b/packages/backend-common/src/reading/HarnessUrlReader.ts
@@ -118,7 +118,7 @@ export class HarnessUrlReader implements UrlReader {
   toString() {
     const { host } = this.integration.config;
     return `harness{host=${host},authed=${Boolean(
-      this.integration.config.token,
+      this.integration.config.token || this.integration.config.apiKey,
     )}}`;
   }
 }
diff --git a/packages/integration/api-report.md b/packages/integration/api-report.md
index a693c1314c..b40b66b0b6 100644
--- a/packages/integration/api-report.md
+++ b/packages/integration/api-report.md
@@ -552,7 +552,7 @@ export type GiteaIntegrationConfig = {
   host: string;
   baseUrl?: string;
   username?: string;
-  token?: string;
+  password?: string;
 };
 
 // @public
@@ -711,8 +711,7 @@ export class HarnessIntegration implements ScmIntegration {
 // @public
 export type HarnessIntegrationConfig = {
   host: string;
-  baseUrl?: string;
-  username?: string;
+  apiKey?: string;
   token?: string;
 };
 
diff --git a/packages/integration/src/harness/HarnessIntegration.test.ts b/packages/integration/src/harness/HarnessIntegration.test.ts
index 9014c0bb79..2d85204f16 100644
--- a/packages/integration/src/harness/HarnessIntegration.test.ts
+++ b/packages/integration/src/harness/HarnessIntegration.test.ts
@@ -25,8 +25,6 @@ describe('HarnessIntegration', () => {
           harness: [
             {
               host: 'app.harness.io',
-              username: 'git',
-              baseUrl: 'https://app.harness.io/route',
               token: '1234',
             },
           ],
@@ -35,9 +33,6 @@ describe('HarnessIntegration', () => {
     });
     expect(integrations.list().length).toBe(1);
     expect(integrations.list()[0].config.host).toBe('app.harness.io');
-    expect(integrations.list()[0].config.baseUrl).toBe(
-      'https://app.harness.io/route',
-    );
   });
 
   it('returns the basics', () => {
diff --git a/packages/integration/src/harness/config.test.ts b/packages/integration/src/harness/config.test.ts
index 6482e89de8..4f6d8496e3 100644
--- a/packages/integration/src/harness/config.test.ts
+++ b/packages/integration/src/harness/config.test.ts
@@ -51,16 +51,14 @@ describe('readHarnessConfig', () => {
     const output = readHarnessConfig(
       buildConfig({
         host: 'a.com',
-        baseUrl: 'https://a.com/route/api',
-        username: 'u',
         token: 'p',
+        apiKey: 'a',
       }),
     );
     expect(output).toEqual({
       host: 'a.com',
-      baseUrl: 'https://a.com/route/api',
-      username: 'u',
       token: 'p',
+      apiKey: 'a',
     });
   });
 
@@ -72,8 +70,6 @@ describe('readHarnessConfig', () => {
     );
     expect(output).toEqual({
       host: 'a.com',
-      baseUrl: 'https://a.com',
-      username: undefined,
       token: undefined,
     });
   });
@@ -95,14 +91,11 @@ describe('readHarnessConfig', () => {
       readHarnessConfig(
         await buildFrontendConfig({
           host: 'a.com',
-          baseUrl: 'https://a.com/route',
-          username: 'u',
           token: 'p',
         }),
       ),
     ).toEqual({
       host: 'a.com',
-      baseUrl: 'https://a.com/route',
     });
   });
 });
diff --git a/packages/integration/src/harness/config.ts b/packages/integration/src/harness/config.ts
index 75482a9b39..748cd141c5 100644
--- a/packages/integration/src/harness/config.ts
+++ b/packages/integration/src/harness/config.ts
@@ -15,11 +15,10 @@
  */
 
 import { Config } from '@backstage/config';
-import { trimEnd } from 'lodash';
 import { isValidHost } from '../helpers';
 
 /**
- * The configuration for a single Gitea integration.
+ * The configuration for a single Harness integration.
  *
  * @public
  */
@@ -28,23 +27,14 @@ export type HarnessIntegrationConfig = {
    * The host of the target that this matches on, e.g. "app.harness.io"
    */
   host: string;
-  /**
-   * The optional base URL of the Harness code instance. It is assumed that https
-   * is used and that the base path is "/" on the host. If that is not the
-   * case set the complete base url to the Harness code instance, e.g.
-   * "https://harnesscode.website.com/". This is the url that you would open
-   * in a browser.
-   */
-  baseUrl?: string;
-  /**
-   * The username to use for requests to harness code.
-   */
-  username?: string;
-
   /**
    * The password or http token to use for authentication.
    */
   token?: string;
+  /**
+   * The API key to use for authentication.
+   */
+  apiKey?: string;
 };
 
 /**
@@ -55,24 +45,20 @@ export type HarnessIntegrationConfig = {
 export function readHarnessConfig(config: Config): HarnessIntegrationConfig {
   const host = config.getString('host');
   let baseUrl = config.getOptionalString('baseUrl');
-  const username = config.getOptionalString('username');
   const token = config.getOptionalString('token');
+  const apiKey = config.getOptionalString('apiKey');
+
   if (!isValidHost(host)) {
     throw new Error(
       `Invalid Harness Code integration config, '${host}' is not a valid host`,
     );
   }
 
-  if (baseUrl) {
-    baseUrl = trimEnd(baseUrl, '/');
-  } else {
-    baseUrl = `https://${host}`;
-  }
+  baseUrl = `https://${host}`;
 
   return {
     host,
-    baseUrl,
-    username,
+    apiKey,
     token,
   };
 }
diff --git a/packages/integration/src/harness/core.test.ts b/packages/integration/src/harness/core.test.ts
index 6502fd3e48..2a214cc06f 100644
--- a/packages/integration/src/harness/core.test.ts
+++ b/packages/integration/src/harness/core.test.ts
@@ -76,20 +76,16 @@ describe('Harness code core', () => {
       ).toBeUndefined();
     });
 
-    it('adds basic auth when username and token are specified', () => {
+    it('adds basic auth when apikey and token are specified', () => {
       const authRequest: HarnessIntegrationConfig = {
         host: 'gerrit.com',
-        username: 'username',
         token: 'P',
+        apiKey: 'a',
       };
 
-      const basicAuthentication = `basic ${Buffer.from(
-        `${authRequest.username}:${authRequest.token}`,
-      ).toString('base64')}`;
-
       expect(
-        (getHarnessRequestOptions(authRequest).headers as any).Authorization,
-      ).toEqual(basicAuthentication);
+        (getHarnessRequestOptions(authRequest).headers as any)['x-api-key'],
+      ).toEqual('a');
     });
   });
 });
diff --git a/packages/integration/src/harness/core.ts b/packages/integration/src/harness/core.ts
index 0c4fb01970..324a57071c 100644
--- a/packages/integration/src/harness/core.ts
+++ b/packages/integration/src/harness/core.ts
@@ -34,7 +34,7 @@ export function getHarnessEditContentsUrl(
   url: string,
 ) {
   try {
-    const baseUrl = config.baseUrl ?? `https://${config.host}`;
+    const baseUrl = `https://${config.host}`;
     const [
       _blank,
       _ng,
@@ -61,9 +61,8 @@ export function getHarnessEditContentsUrl(
 }
 
 /**
- * Given a URL pointing to a file, returns an api URL
- * for fetching the contents of the data.
- *
+ * Given a file path URL,
+ * it returns an API URL which returns the contents of the file.
  * @remarks
  *
  * Converts
@@ -79,7 +78,7 @@ export function getHarnessFileContentsUrl(
   url: string,
 ) {
   try {
-    const baseUrl = config.baseUrl ?? `https://${config.host}`;
+    const baseUrl = `https://${config.host}`;
     const [
       _blank,
       _ng,
@@ -115,16 +114,14 @@ export function getHarnessRequestOptions(config: HarnessIntegrationConfig): {
   headers?: Record<string, string>;
 } {
   const headers: Record<string, string> = {};
-  const { username, token } = config;
+  const { token, apiKey } = config;
 
   if (!token) {
     return headers;
   }
 
-  if (username) {
-    headers.Authorization = `basic ${Buffer.from(
-      `${username}:${token}`,
-    ).toString('base64')}`;
+  if (apiKey) {
+    headers['x-api-key'] = apiKey;
   } else {
     headers.Authorization = `Bearer ${token}`;
   }