diff --git a/configuration.ts b/configuration.ts
index 5dc9caa..adc0b49 100644
--- a/configuration.ts
+++ b/configuration.ts
@@ -32,6 +32,7 @@ export interface ConfigurationParameters {
     clientId?: string;
     clientSecret?: string;
     accessToken?: string | Promise<string> | ((name?: string, scopes?: string[]) => string) | ((name?: string, scopes?: string[]) => Promise<string>);
+    accessTokenUrl?: string;
     awsv4?: AWSv4Configuration;
     basePath?: string;
     serverIndex?: number;
@@ -67,6 +68,10 @@ export class Configuration {
      * @param scopes oauth2 scope
      */
     accessToken?: string | Promise<string> | ((name?: string, scopes?: string[]) => string) | ((name?: string, scopes?: string[]) => Promise<string>);
+    /**
+     * oauth2 token url
+     */
+    accessTokenUrl?: string;
     /**
      * temporary access token storage
      */
@@ -115,6 +120,7 @@ export class Configuration {
         this.clientSecret = param.clientSecret;
         this.tempAccessToken;
         this.tempAccessTokenExpiration;
+        this.accessTokenUrl = param.accessTokenUrl ?? 'https://api.bandwidth.com/api/v1/oauth2/token';
         this.accessToken = param.accessToken ?? (async (name, scopes) => {
             const now = Math.floor(Date.now() / 1000);
             if (this.tempAccessToken && (!this.tempAccessTokenExpiration || this.tempAccessTokenExpiration > now + 60)) {
@@ -125,7 +131,7 @@ export class Configuration {
                     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
                     auth: { username: this.clientId || '', password: this.clientSecret || '' },
                     data: 'grant_type=client_credentials',
-                    url: 'https://api.bandwidth.com/api/v1/oauth2/token'
+                    url: this.accessTokenUrl
                 };
                 const response = await globalAxios.request(tokenRequestArgs);
                 this.tempAccessToken = response.data.access_token;
diff --git a/custom_templates/configuration.mustache b/custom_templates/configuration.mustache
index 0a89e94..d4ce2ba 100644
--- a/custom_templates/configuration.mustache
+++ b/custom_templates/configuration.mustache
@@ -22,6 +22,7 @@ export interface ConfigurationParameters {
     clientId?: string;
     clientSecret?: string;
     accessToken?: string | Promise<string> | ((name?: string, scopes?: string[]) => string) | ((name?: string, scopes?: string[]) => Promise<string>);
+    accessTokenUrl?: string;
     awsv4?: AWSv4Configuration;
     basePath?: string;
     serverIndex?: number;
@@ -57,6 +58,10 @@ export class Configuration {
      * @param scopes oauth2 scope
      */
     accessToken?: string | Promise<string> | ((name?: string, scopes?: string[]) => string) | ((name?: string, scopes?: string[]) => Promise<string>);
+    /**
+     * oauth2 token url
+     */
+    accessTokenUrl?: string;
     /**
      * temporary access token storage
      */
@@ -105,6 +110,7 @@ export class Configuration {
         this.clientSecret = param.clientSecret;
         this.tempAccessToken;
         this.tempAccessTokenExpiration;
+        this.accessTokenUrl = param.accessTokenUrl ?? 'https://api.bandwidth.com/api/v1/oauth2/token';
         this.accessToken = param.accessToken ?? (async (name, scopes) => {
             const now = Math.floor(Date.now() / 1000);
             if (this.tempAccessToken && (!this.tempAccessTokenExpiration || this.tempAccessTokenExpiration > now + 60)) {
@@ -115,7 +121,7 @@ export class Configuration {
                     headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
                     auth: { username: this.clientId || '', password: this.clientSecret || '' },
                     data: 'grant_type=client_credentials',
-                    url: 'https://api.bandwidth.com/api/v1/oauth2/token'
+                    url: this.accessTokenUrl
                 };
                 const response = await globalAxios.request(tokenRequestArgs);
                 this.tempAccessToken = response.data.access_token;
diff --git a/tests/unit/api/calls-api.test.ts b/tests/unit/api/calls-api.test.ts
index 3cb17ca..87b8a7b 100644
--- a/tests/unit/api/calls-api.test.ts
+++ b/tests/unit/api/calls-api.test.ts
@@ -12,8 +12,7 @@ import {
 
 describe('CallsApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const callsApi = new CallsApi(config);
diff --git a/tests/unit/api/conferences-api.test.ts b/tests/unit/api/conferences-api.test.ts
index ef099c9..9dbefc6 100644
--- a/tests/unit/api/conferences-api.test.ts
+++ b/tests/unit/api/conferences-api.test.ts
@@ -10,8 +10,7 @@ import {
 
 describe('ConferencesApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const conferencesApi = new ConferencesApi(config);
diff --git a/tests/unit/api/endpoints-api.test.ts b/tests/unit/api/endpoints-api.test.ts
index 4af3bab..c0f73c3 100644
--- a/tests/unit/api/endpoints-api.test.ts
+++ b/tests/unit/api/endpoints-api.test.ts
@@ -9,8 +9,7 @@ import {
 
 describe('EndpointsApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const endpointsApi = new EndpointsApi(config);
diff --git a/tests/unit/api/media-api.test.ts b/tests/unit/api/media-api.test.ts
index b2826d8..1bd7811 100644
--- a/tests/unit/api/media-api.test.ts
+++ b/tests/unit/api/media-api.test.ts
@@ -3,8 +3,7 @@ import { Configuration } from '../../../configuration';
 
 describe('MediaApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const mediaApi = new MediaApi(config);
diff --git a/tests/unit/api/messages-api.test.ts b/tests/unit/api/messages-api.test.ts
index 5f8e7f8..da5f7bb 100644
--- a/tests/unit/api/messages-api.test.ts
+++ b/tests/unit/api/messages-api.test.ts
@@ -12,8 +12,7 @@ import {
 
 describe('MessagesApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const messagesApi = new MessagesApi(config);
diff --git a/tests/unit/api/mfaapi.test.ts b/tests/unit/api/mfaapi.test.ts
index 3eed5f1..72902a4 100644
--- a/tests/unit/api/mfaapi.test.ts
+++ b/tests/unit/api/mfaapi.test.ts
@@ -5,8 +5,7 @@ import { CodeRequest, VerifyCodeRequest } from '../../../models';
 
 describe('MFAApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const mfaApi = new MFAApi(config);
diff --git a/tests/unit/api/multi-channel-api.test.ts b/tests/unit/api/multi-channel-api.test.ts
index a21bc06..cb0a85a 100644
--- a/tests/unit/api/multi-channel-api.test.ts
+++ b/tests/unit/api/multi-channel-api.test.ts
@@ -13,8 +13,7 @@ import {
 
 describe('MultiChannelApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const multiChannelApi = new MultiChannelApi(config);
diff --git a/tests/unit/api/phone-number-lookup-api.test.ts b/tests/unit/api/phone-number-lookup-api.test.ts
index c773b92..3a678cd 100644
--- a/tests/unit/api/phone-number-lookup-api.test.ts
+++ b/tests/unit/api/phone-number-lookup-api.test.ts
@@ -11,8 +11,7 @@ import {
 
 describe('PhoneNumberLookupApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const phoneNumberLookupApi = new PhoneNumberLookupApi(config);
diff --git a/tests/unit/api/recordings-api.test.ts b/tests/unit/api/recordings-api.test.ts
index d819f88..e48ddba 100644
--- a/tests/unit/api/recordings-api.test.ts
+++ b/tests/unit/api/recordings-api.test.ts
@@ -10,8 +10,7 @@ import {
 
 describe('RecordingsApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const recordingsApi = new RecordingsApi(config);
diff --git a/tests/unit/api/statistics-api.test.ts b/tests/unit/api/statistics-api.test.ts
index 2d2631b..5989905 100644
--- a/tests/unit/api/statistics-api.test.ts
+++ b/tests/unit/api/statistics-api.test.ts
@@ -4,8 +4,7 @@ import { Configuration } from '../../../configuration';
 
 describe('StatisticsApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const statisticsApi = new StatisticsApi(config);
diff --git a/tests/unit/api/toll-free-verification-api.test.ts b/tests/unit/api/toll-free-verification-api.test.ts
index d66d267..11b9a72 100644
--- a/tests/unit/api/toll-free-verification-api.test.ts
+++ b/tests/unit/api/toll-free-verification-api.test.ts
@@ -13,8 +13,7 @@ import {
 
 describe('TollFreeVerificationApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const tfvApi = new TollFreeVerificationApi(config);
diff --git a/tests/unit/api/transcriptions-api.test.ts b/tests/unit/api/transcriptions-api.test.ts
index ae15c3f..c46bbf7 100644
--- a/tests/unit/api/transcriptions-api.test.ts
+++ b/tests/unit/api/transcriptions-api.test.ts
@@ -4,8 +4,7 @@ import { CallTranscriptionDetectedLanguageEnum, CallTranscriptionTrackEnum } fro
 
 describe('TranscriptionsApi', () => {
     const config = new Configuration({
-        username: BW_USERNAME,
-        password: BW_PASSWORD,
+        accessToken: 'abcd1234',
         basePath: 'http://127.0.0.1:4010'
     });
     const transcriptionsApi = new TranscriptionsApi(config);