Rotating OAuth client secrets without downtime — step by step

What You Will Build

• A dual-credential authentication wrapper that allows your application to switch between two active Genesys Cloud OAuth client secrets seamlessly.
• This solution uses the Genesys Cloud REST API and the Python SDK (genesyscloud) to manage token acquisition and caching.
• The implementation is covered in Python, providing a pattern applicable to any language supporting concurrent requests.

Prerequisites

• OAuth Client Type: Confidential Client (Client Credentials Grant flow).
• Required Scopes: user:read, user:write, or any scope your application requires. The rotation process itself does not require special administrative scopes, but the resulting tokens must have the scopes your app needs.
• SDK Version: genesyscloud Python SDK v142.0.0 or later.
• Language/Runtime: Python 3.9+.
• External Dependencies:
  • genesyscloud: The official Genesys Cloud Python SDK.
  • requests: For direct HTTP calls if bypassing the SDK for token acquisition (optional, but shown for clarity).
  • threading: Standard library for handling concurrent token refresh attempts.

Authentication Setup

The core challenge of secret rotation is that OAuth tokens are tied to the specific client secret used to generate them. When you rotate a secret in the Genesys Cloud Admin console, the old secret becomes invalid immediately. If your application is using a token generated by the old secret, that token may still be valid until its expiry, but you cannot refresh it or generate a new one using the old secret.

To achieve zero downtime, you must maintain two active secrets in Genesys Cloud. You will register a second secret for your existing OAuth Client. Your application will be configured to know both Secret A and Secret B. The rotation process involves switching the application’s “active” secret from A to B, verifying B works, and then disabling Secret A in the admin console.

The Dual-Secret Wrapper

We will build a DualSecretAuth class. This class holds both secrets and maintains a cache of valid access tokens for each. It exposes a single method, get_access_token(), which returns a valid token. If the active secret’s token is expired or invalid, it attempts to generate a new one. If that fails (e.g., because the secret was just rotated out), it fails over to the secondary secret.

import time
import threading
from typing import Optional, Dict, Any
from genesyscloud.platform_client_v2 import platform_client
from genesyscloud.authentication.api import AuthenticationApi
from genesyscloud.authentication.model import Oauth2ClientCredentialsBody

class DualSecretAuth:
    def __init__(self, client_id: str, secret_a: str, secret_b: str, environment: str = 'mypurecloud.com'):
        self.client_id = client_id
        self.secrets = {
            'a': secret_a,
            'b': secret_b
        }
        # Track which secret is currently considered "primary"
        self.active_secret_key = 'a'
        
        # Token cache: { secret_key: { 'token': str, 'expires_at': float } }
        self.token_cache: Dict[str, Dict[str, Any]] = {}
        
        # Lock to prevent race conditions during token refresh
        self.lock = threading.Lock()
        
        # Base URL for the token endpoint
        self.base_url = f"https://{environment}"
        
    def _get_token_from_cache(self, secret_key: str) -> Optional[str]:
        """Retrieve a token from cache if it is still valid."""
        if secret_key in self.token_cache:
            cache_entry = self.token_cache[secret_key]
            # Subtract 60 seconds for safety buffer
            if cache_entry['expires_at'] > time.time() - 60:
                return cache_entry['token']
        return None

    def _acquire_token(self, secret_key: str) -> str:
        """
        Acquire a new OAuth token using the specified secret key.
        Raises an exception if the secret is invalid.
        """
        secret = self.secrets[secret_key]
        
        # Configure the SDK client for the specific secret
        # Note: We create a temporary instance to isolate configuration
        platform_client.set_environment(self.base_url)
        
        auth_api = AuthenticationApi(platform_client)
        
        body = Oauth2ClientCredentialsBody(
            client_id=self.client_id,
            client_secret=secret
        )
        
        try:
            # The SDK handles the POST to /api/v2/oauth/token
            response = auth_api.post_oauth2_token(body=body)
            
            # Cache the token
            self.token_cache[secret_key] = {
                'token': response.access_token,
                'expires_at': time.time() + response.expires_in
            }
            
            return response.access_token
            
        except Exception as e:
            # Clear cache for this secret if acquisition fails
            if secret_key in self.token_cache:
                del self.token_cache[secret_key]
            raise e

    def get_access_token(self) -> str:
        """
        Returns a valid access token.
        Tries the active secret first. If it fails, fails over to the secondary secret.
        """
        primary_key = self.active_secret_key
        secondary_key = 'b' if primary_key == 'a' else 'a'
        
        # 1. Check cache for primary
        token = self._get_token_from_cache(primary_key)
        if token:
            return token
            
        # 2. Try to acquire new token from primary
        try:
            with self.lock:
                # Double-check inside lock to prevent duplicate calls
                token = self._get_token_from_cache(primary_key)
                if token:
                    return token
                token = self._acquire_token(primary_key)
                return token
        except Exception as e:
            # Primary secret failed (likely rotated out). Switch to secondary.
            print(f"Primary secret '{primary_key}' failed: {e}. Failing over to '{secondary_key}'.")
            
            # 3. Check cache for secondary
            token = self._get_token_from_cache(secondary_key)
            if token:
                # If secondary is valid, switch active key to secondary immediately
                self.active_secret_key = secondary_key
                return token
            
            # 4. Acquire new token from secondary
            try:
                with self.lock:
                    token = self._acquire_token(secondary_key)
                    # Switch active key to secondary since it worked
                    self.active_secret_key = secondary_key
                    return token
            except Exception as secondary_error:
                raise Exception(f"Both secrets failed. Primary: {e}, Secondary: {secondary_error}")

Implementation

Step 1: Register the Second Secret in Genesys Cloud

Before writing more code, you must have two active secrets. This is an administrative step, but it is critical for the code to work.

1. Log in to the Genesys Cloud Admin console.
2. Navigate to Developers > Apps > OAuth Clients.
3. Select your application.
4. In the Secrets section, click Add Secret.
5. Copy the new secret value. This is Secret B.
6. Do not delete or disable the old secret (Secret A) yet.

Your application configuration should now hold both secrets.

Step 2: Initialize the Dual-Secret Wrapper

In your main application entry point, initialize the DualSecretAuth class. This ensures that your application starts with Secret A as the primary, but has Secret B ready as a fallback.

import os
from dual_secret_auth import DualSecretAuth

# Load from environment variables
CLIENT_ID = os.environ.get('GENESYS_CLIENT_ID')
SECRET_A = os.environ.get('GENESYS_SECRET_A')
SECRET_B = os.environ.get('GENESYS_SECRET_B')
ENVIRONMENT = os.environ.get('GENESYS_ENVIRONMENT', 'mypurecloud.com')

if not all([CLIENT_ID, SECRET_A, SECRET_B]):
    raise ValueError("Missing required environment variables: GENESYS_CLIENT_ID, SECRET_A, GENESYS_SECRET_B")

# Initialize the auth wrapper
auth_wrapper = DualSecretAuth(
    client_id=CLIENT_ID,
    secret_a=SECRET_A,
    secret_b=SECRET_B,
    environment=ENVIRONMENT
)

Step 3: Use the Token in API Calls

Now, instead of using the standard SDK default authentication, you will manually inject the token from your wrapper. The Genesys Cloud Python SDK allows you to set the access token on the platform_client instance directly.

from genesyscloud.platform_client_v2 import platform_client
from genesyscloud.user_management.api import UserManagementApi

def get_current_user():
    # 1. Get a valid token from our wrapper
    access_token = auth_wrapper.get_access_token()
    
    # 2. Configure the platform client with this token
    # Note: The SDK's default client is a singleton. Be careful in multi-threaded apps.
    # For production, consider creating a new ApiClient instance per request or per thread.
    platform_client.set_access_token(access_token)
    
    # 3. Make the API call
    user_api = UserManagementApi(platform_client)
    
    try:
        # GET /api/v2/users/me
        response = user_api.get_user_me()
        return response
    except Exception as e:
        # If the token is invalid (e.g., 401), the wrapper will retry on the next call
        # because the cache will be cleared or the token will be expired.
        print(f"API Call failed: {e}")
        raise

# Usage
user = get_current_user()
print(f"Logged in as: {user.name} ({user.email})")

Step 4: The Rotation Procedure

The actual “rotation” happens in two phases: application-side switch and admin-side cleanup.

Phase 1: Application-Side Switch

You do not need to restart your application. You simply change the active_secret_key in your wrapper. However, to be safe, you should verify the new secret works before switching traffic.

def rotate_secret_to_b():
    """
    Switches the active secret from A to B.
    This should be called manually or via a health check endpoint.
    """
    # 1. Verify Secret B works
    try:
        # Force a token acquisition with Secret B to test it
        auth_wrapper._acquire_token('b')
        print("Secret B is valid.")
    except Exception as e:
        print(f"Secret B failed validation: {e}")
        return False

    # 2. Switch the active key
    auth_wrapper.active_secret_key = 'b'
    print("Active secret switched to B.")
    
    # 3. Clear cache for Secret A to ensure we don't use stale tokens
    if 'a' in auth_wrapper.token_cache:
        del auth_wrapper.token_cache['a']
        
    return True

# Call this when you are ready to rotate
if __name__ == "__main__":
    rotate_secret_to_b()

Phase 2: Admin-Side Cleanup

1. Wait for at least one token expiry cycle (or ensure all long-lived tokens from Secret A have expired).
2. Log in to the Genesys Cloud Admin console.
3. Navigate to Developers > Apps > OAuth Clients.
4. Select your application.
5. Disable or delete Secret A.
6. Secret B is now your sole secret.
7. To prepare for the next rotation, generate Secret C and update your application environment variables to include Secret C as the new secondary.

Complete Working Example

This is a complete, runnable script that demonstrates the dual-secret authentication, token acquisition, and a simple API call.

import os
import time
import threading
from typing import Optional, Dict, Any
from genesyscloud.platform_client_v2 import platform_client
from genesyscloud.authentication.api import AuthenticationApi
from genesyscloud.authentication.model import Oauth2ClientCredentialsBody
from genesyscloud.user_management.api import UserManagementApi

class DualSecretAuth:
    """
    A wrapper for Genesys Cloud OAuth that supports two active secrets for zero-downtime rotation.
    """
    def __init__(self, client_id: str, secret_a: str, secret_b: str, environment: str = 'mypurecloud.com'):
        self.client_id = client_id
        self.secrets = {
            'a': secret_a,
            'b': secret_b
        }
        self.active_secret_key = 'a'
        self.token_cache: Dict[str, Dict[str, Any]] = {}
        self.lock = threading.Lock()
        self.base_url = f"https://{environment}"
        
    def _get_token_from_cache(self, secret_key: str) -> Optional[str]:
        if secret_key in self.token_cache:
            cache_entry = self.token_cache[secret_key]
            if cache_entry['expires_at'] > time.time() - 60:
                return cache_entry['token']
        return None

    def _acquire_token(self, secret_key: str) -> str:
        secret = self.secrets[secret_key]
        platform_client.set_environment(self.base_url)
        auth_api = AuthenticationApi(platform_client)
        
        body = Oauth2ClientCredentialsBody(
            client_id=self.client_id,
            client_secret=secret
        )
        
        try:
            response = auth_api.post_oauth2_token(body=body)
            self.token_cache[secret_key] = {
                'token': response.access_token,
                'expires_at': time.time() + response.expires_in
            }
            return response.access_token
        except Exception as e:
            if secret_key in self.token_cache:
                del self.token_cache[secret_key]
            raise e

    def get_access_token(self) -> str:
        primary_key = self.active_secret_key
        secondary_key = 'b' if primary_key == 'a' else 'a'
        
        # Try primary
        token = self._get_token_from_cache(primary_key)
        if token:
            return token
            
        try:
            with self.lock:
                token = self._get_token_from_cache(primary_key)
                if token:
                    return token
                token = self._acquire_token(primary_key)
                return token
        except Exception as e:
            print(f"Primary secret '{primary_key}' failed: {e}. Failing over.")
            
            # Try secondary
            token = self._get_token_from_cache(secondary_key)
            if token:
                self.active_secret_key = secondary_key
                return token
            
            try:
                with self.lock:
                    token = self._acquire_token(secondary_key)
                    self.active_secret_key = secondary_key
                    return token
            except Exception as secondary_error:
                raise Exception(f"Both secrets failed. Primary: {e}, Secondary: {secondary_error}")

def main():
    # Configuration
    CLIENT_ID = os.environ.get('GENESYS_CLIENT_ID')
    SECRET_A = os.environ.get('GENESYS_SECRET_A')
    SECRET_B = os.environ.get('GENESYS_SECRET_B')
    ENVIRONMENT = os.environ.get('GENESYS_ENVIRONMENT', 'mypurecloud.com')

    if not all([CLIENT_ID, SECRET_A, SECRET_B]):
        print("Error: Missing environment variables. Set GENESYS_CLIENT_ID, GENESYS_SECRET_A, GENESYS_SECRET_B.")
        return

    # Initialize Auth
    auth = DualSecretAuth(CLIENT_ID, SECRET_A, SECRET_B, ENVIRONMENT)

    # Test 1: Get token with primary secret
    print("Test 1: Acquiring token with primary secret (A)...")
    try:
        token_a = auth.get_access_token()
        print(f"Success. Token starts with: {token_a[:10]}...")
    except Exception as e:
        print(f"Failed: {e}")
        return

    # Simulate API Call
    print("\nTest 2: Making API call to get current user...")
    platform_client.set_access_token(token_a)
    user_api = UserManagementApi(platform_client)
    try:
        user = user_api.get_user_me()
        print(f"Success. User: {user.name}")
    except Exception as e:
        print(f"API Call Failed: {e}")

    # Test 3: Simulate Rotation
    print("\nTest 3: Simulating secret rotation...")
    # In a real scenario, you would disable Secret A in the Admin console here.
    # For this demo, we will just switch the active key and assume Secret B is valid.
    
    # Verify Secret B
    try:
        auth._acquire_token('b')
        print("Secret B is valid.")
    except Exception as e:
        print(f"Secret B failed: {e}")
        return

    # Switch active key
    auth.active_secret_key = 'b'
    print("Active secret switched to B.")

    # Test 4: Get token with new primary (B)
    print("\nTest 4: Acquiring token with new primary secret (B)...")
    try:
        token_b = auth.get_access_token()
        print(f"Success. Token starts with: {token_b[:10]}...")
        
        # Verify it works for API calls
        platform_client.set_access_token(token_b)
        user_api2 = UserManagementApi(platform_client)
        user2 = user_api2.get_user_me()
        print(f"API Call Success. User: {user2.name}")
    except Exception as e:
        print(f"Failed: {e}")

if __name__ == "__main__":
    main()

Common Errors & Debugging

Error: 401 Unauthorized

What causes it:
The OAuth token you are using is either expired or was generated with a secret that has been invalidated.

How to fix it:
Ensure your DualSecretAuth wrapper is correctly configured with both secrets. If you receive a 401 on an API call, check the logs. If the primary secret fails, the wrapper should automatically fall back to the secondary. If both fail, verify that both secrets are still active in the Genesys Cloud Admin console.

Code showing the fix:
The get_access_token method in the DualSecretAuth class already handles this by catching exceptions from _acquire_token and switching to the secondary key.

Error: 429 Too Many Requests

What causes it:
You are generating tokens too frequently. The Genesys Cloud OAuth endpoint has rate limits.

How to fix it:
Ensure you are caching tokens effectively. The DualSecretAuth class caches tokens until they are 60 seconds from expiration. Do not call get_access_token() on every single API request if you can reuse the token.

Code showing the fix:
The _get_token_from_cache method checks the expires_at timestamp. Only if the token is expired or close to expiration does it trigger a new acquisition.

Error: Invalid Grant

What causes it:
The client secret provided is incorrect or has been deleted.

How to fix it:
Verify that the client_id and client_secret match exactly what is in the Genesys Cloud Admin console. Check for trailing spaces or newlines in your environment variables.

Code showing the fix:
Ensure your environment variables are trimmed:

SECRET_A = os.environ.get('GENESYS_SECRET_A', '').strip()

Official References

• Genesys Cloud OAuth 2.0 Authentication
• Genesys Cloud Python SDK Documentation
• Rotating Client Secrets Best Practices

This seems like a standard rotation scenario, but you are missing the validation step.

401 Unauthorized: Invalid grant

Rotate the secret via POST /api/v2/oauth/clients/{id}/rotate-secret. The old secret remains valid for 24 hours. Update your config with the new secret, then restart the service. Verify the new token works before the window closes.

It varies, but usually the 24-hour window is risky for production Python services relying on long-lived tokens.

1. Call POST /api/v2/oauth/clients/{id}/rotate-secret to generate the new secret.
2. Immediately update your application’s configuration with the new secret and restart the service to fetch a new access token.
3. Verify the new token works using GET /api/v2/oauth/tokeninfo before the old secret expires.

The simplest way to resolve this is to implement a dual-secret fallback in your Python SDK initialization. The suggestion above mentions the 24-hour window, but relying on a hard restart during that window is risky if your token cache persists. You can keep the old secret as a fallback while the new one becomes active.

Use configuration.set_oauth2_credentials with a custom token retrieval function that tries the new secret first, then falls back to the old one. This ensures no downtime even if the rotation happens while a long-running process holds an expired token.

from genesyscloud.platform_client_v2 import Configuration, PureCloudPlatformClientV2

def get_token_with_fallback(new_client_id, new_client_secret, old_client_id, old_client_secret):
 # Try new credentials first
 try:
 config = Configuration()
 config.host = "https://api.mypurecloud.com"
 config.set_oauth2_credentials(
 client_id=new_client_id, 
 client_secret=new_client_secret, 
 grant_type='client_credentials'
 )
 client = PureCloudPlatformClientV2(config)
 # Force a token refresh to validate
 client.oauth_client.get_token()
 return client
 except Exception as e:
 # Fallback to old credentials if new one fails
 config_old = Configuration()
 config_old.host = "https://api.mypurecloud.com"
 config_old.set_oauth2_credentials(
 client_id=old_client_id, 
 client_secret=old_client_secret, 
 grant_type='client_credentials'
 )
 client_old = PureCloudPlatformClientV2(config_old)
 client_old.oauth_client.get_token()
 return client_old

# Usage during rotation
client = get_token_with_fallback(
 new_client_id="your_new_id",
 new_client_secret="your_new_secret",
 old_client_id="your_old_id",
 old_client_secret="your_old_secret"
)

This approach handles the grace period gracefully. You can update the config file with the new secret, restart the service, and the code will automatically switch to the new secret once it starts working. The old secret remains valid for 24 hours, so the fallback is just a safety net.

Warning: Ensure your client_credentials scope is consistent between old and new secrets. Mismatched scopes will cause API errors even if the token is valid.

This looks like a standard rotation scenario. The 24-hour window is fine if your infrastructure supports it. In Terraform, you can automate the secret rotation and config update atomically.

resource "genesyscloud_oauth_client" "this" {
 name = "my-client"
 secret = var.new_secret
}

Ensure your pipeline updates var.new_secret before applying. No manual API calls needed.