diff --git a/credentials/BillbeeApi.credentials.ts b/credentials/BillbeeApi.credentials.ts
index f66c3c2..4683e1f 100644
--- a/credentials/BillbeeApi.credentials.ts
+++ b/credentials/BillbeeApi.credentials.ts
@@ -1,48 +1,59 @@
 import type {
-        IAuthenticateGeneric,
-        Icon,
-        ICredentialType,
-        INodeProperties,
+    IAuthenticateGeneric,
+    Icon,
+    ICredentialType,
+    INodeProperties,
 } from 'n8n-workflow';
 
 export class BillbeeApi implements ICredentialType {
-        name = 'N8nDevBillbeeApi';
+    name = 'N8nDevBillbeeApi';
+    displayName = 'Billbee API';
+    icon: Icon = { light: 'file:../nodes/Billbee/billbee.png', dark: 'file:../nodes/Billbee/billbee.dark.png' };
+    documentationUrl = '';
 
-        displayName = 'Billbee API';
+    properties: INodeProperties[] = [
+        {
+            displayName: 'Base URL',
+            name: 'url',
+            type: 'string',
+            default: 'https://app.billbee.io',
+            required: true,
+        },
+        {
+            displayName: 'API Key',
+            name: 'apiKey',
+            type: 'string',
+            typeOptions: { password: true },
+            default: '',
+            required: true,
+        },
+        {
+            displayName: 'Billbee Benutzername / E-Mail',
+            name: 'username',
+            type: 'string',
+            default: '',
+            required: true,
+        },
+        {
+            displayName: 'API-Passwort',
+            name: 'password',
+            type: 'string',
+            typeOptions: { password: true },
+            default: '',
+            required: true,
+        },
+    ];
 
-        icon: Icon = { light: 'file:../nodes/Billbee/billbee.png', dark: 'file:../nodes/Billbee/billbee.dark.png' };
-
-        documentationUrl = '';
-
-        properties: INodeProperties[] = [
-          {
-                        displayName: 'Base URL',
-                        name: 'url',
-                        type: 'string',
-                        default: 'https://app.billbee.io',
-                        required: true,
-                        placeholder: 'https://app.billbee.io',
-                        description: 'The base URL of your Billbee API server',
-                },
-                {
-                        displayName: 'API Key',
-                        name: 'apiKey',
-                        type: 'string',
-                        typeOptions: { password: true },
-                        default: '',
-                        required: false,
-                },
-        
-        ];
-
-  authenticate: IAuthenticateGeneric = {
-                type: 'generic',
-                properties: {
-                        headers: {
-                                'X-Billbee-Api-Key': '={{$credentials.apiKey}}',
-                        },
-                },
-        };
-
-
-}
+    authenticate: IAuthenticateGeneric = {
+        type: 'generic',
+        properties: {
+            headers: {
+                'X-Billbee-Api-Key': '={{$credentials.apiKey}}',
+            },
+            auth: {
+                username: '={{$credentials.username}}',
+                password: '={{$credentials.password}}',
+            },
+        },
+    };
+}
\ No newline at end of file