diff --git a/.eslintcache b/.eslintcache
deleted file mode 100644
index b168282..0000000
--- a/.eslintcache
+++ /dev/null
@@ -1 +0,0 @@
-[{"/home/tempuser-hh19ma/run/codegen-output/scalev/scalev-api-typescript/packages/mcp-server/src/options.ts":"1"},{"size":17015,"mtime":1759200151091,"results":"2","hashOfConfig":"3"},{"filePath":"4","messages":"5","suppressedMessages":"6","errorCount":0,"fatalErrorCount":0,"warningCount":0,"fixableErrorCount":0,"fixableWarningCount":0},"1tnjd9b","/home/tempuser-hh19ma/run/codegen-output/scalev/scalev-api-typescript/packages/mcp-server/src/options.ts",[],[]]
\ No newline at end of file
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 4c313f9..dd8fde7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.4.0"
+  ".": "1.5.0"
 }
diff --git a/.stats.yml b/.stats.yml
index 7bad8a9..a595fd2 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 122
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/scalev%2Fscalev-api-c0c1f73c9c4d045960a09c56b3133d0d7b2aada33ae2d8eeb3012fd30f4b9422.yml
-openapi_spec_hash: d5eabf570425a38dc4850e3351349c6e
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/scalev%2Fscalev-api-2243377a8df2212c2b54dedf2c69c3bc84e69bafa1a86998b483a262be700e85.yml
+openapi_spec_hash: 51247cf56509245d7df2e29dd6139031
 config_hash: 4042035d2fcc36ea4e98423b845f7dcb
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f17fe6..9761e87 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## 1.5.0 (2025-10-02)
+
+Full Changelog: [v1.4.0...v1.5.0](https://github.com/scalev-id/sdk/compare/v1.4.0...v1.5.0)
+
+### Features
+
+* **api:** api update ([1f7710f](https://github.com/scalev-id/sdk/commit/1f7710fc006322ed620802119babd7ce4a0553f7))
+
+
+### Chores
+
+* **internal:** codegen related update ([0920320](https://github.com/scalev-id/sdk/commit/0920320a6a661e4845e4db667a9b90a98131416f))
+* **internal:** remove .eslintcache ([3d8d678](https://github.com/scalev-id/sdk/commit/3d8d678e46bd214df9a7799fd3d0025511683044))
+
 ## 1.4.0 (2025-09-30)
 
 Full Changelog: [v1.3.0...v1.4.0](https://github.com/scalev-id/sdk/compare/v1.3.0...v1.4.0)
diff --git a/package.json b/package.json
index 07b91c7..f59f9a1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "scalev-api",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "The official TypeScript library for the Scalev API API",
   "author": "Scalev API <tech@scalev.id>",
   "types": "dist/index.d.ts",
diff --git a/packages/mcp-server/package.json b/packages/mcp-server/package.json
index 1a2629a..d1ba432 100644
--- a/packages/mcp-server/package.json
+++ b/packages/mcp-server/package.json
@@ -1,6 +1,6 @@
 {
   "name": "scalev-mcp",
-  "version": "1.4.0",
+  "version": "1.5.0",
   "description": "The official MCP Server for the Scalev API API",
   "author": "Scalev API <tech@scalev.id>",
   "types": "dist/index.d.ts",
diff --git a/packages/mcp-server/src/server.ts b/packages/mcp-server/src/server.ts
index 27ebc03..ea70470 100644
--- a/packages/mcp-server/src/server.ts
+++ b/packages/mcp-server/src/server.ts
@@ -34,7 +34,7 @@ export const newMcpServer = () =>
   new McpServer(
     {
       name: 'scalev_api_api',
-      version: '1.4.0',
+      version: '1.5.0',
     },
     { capabilities: { tools: {}, logging: {} } },
   );
diff --git a/packages/mcp-server/src/tools/businesses/retrieve-enabled-epayments-businesses.ts b/packages/mcp-server/src/tools/businesses/retrieve-enabled-epayments-businesses.ts
index 13ebba0..27500a5 100644
--- a/packages/mcp-server/src/tools/businesses/retrieve-enabled-epayments-businesses.ts
+++ b/packages/mcp-server/src/tools/businesses/retrieve-enabled-epayments-businesses.ts
@@ -12,7 +12,7 @@ export const metadata: Metadata = {
   tags: [],
   httpMethod: 'get',
   httpPath: '/v2/businesses/enabled-epayments',
-  operationId: 'ScalevApiWeb.BusinessGlobalController.get_enabled_epayments',
+  operationId: 'ScalevApiWeb.BusinessGlobalController.get_enabled_payments (2)',
 };
 
 export const tool: Tool = {
diff --git a/src/client.ts b/src/client.ts
index 48a75a0..9ab165c 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -351,24 +351,25 @@ export class ScalevAPI {
   }
 
   protected validateHeaders({ values, nulls }: NullableHeaders) {
-    return;
-  }
+    if (this.apiKey && values.get('authorization')) {
+      return;
+    }
+    if (nulls.has('authorization')) {
+      return;
+    }
 
-  protected async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
-    return buildHeaders([await this.bearerAPIKeyAuth(opts), await this.oauth2Auth(opts)]);
+    throw new Error(
+      'Could not resolve authentication method. Expected the apiKey to be set. Or for the "Authorization" headers to be explicitly omitted',
+    );
   }
 
-  protected async bearerAPIKeyAuth(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
+  protected async authHeaders(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
     if (this.apiKey == null) {
       return undefined;
     }
     return buildHeaders([{ Authorization: `Bearer ${this.apiKey}` }]);
   }
 
-  protected async oauth2Auth(opts: FinalRequestOptions): Promise<NullableHeaders | undefined> {
-    return undefined;
-  }
-
   /**
    * Basic re-implementation of `qs.stringify` for primitive types.
    */
diff --git a/src/version.ts b/src/version.ts
index 391e342..e514fa0 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '1.4.0'; // x-release-please-version
+export const VERSION = '1.5.0'; // x-release-please-version