Programmatic Call Transfers via the Genesys Cloud Conversations API

What You Will Build

• You will write a script that identifies an active voice conversation and transfers it to a different routing queue.
• You will use the PATCH /api/v2/interactions/conversations endpoint to update the interaction’s metadata.
• You will use Python with the requests library to handle authentication and API execution.

Prerequisites

• OAuth Client Type: Private Integration or Public Integration (with redirect URI configured if public).
• Required Scopes: conversation:write, interaction:write, routing:queue:read.
• SDK Version: Native HTTP API (no SDK wrapper required for this specific PATCH operation, though the Python SDK PureCloudPlatformClientV2 can be used).
• Language/Runtime: Python 3.8+.
• Dependencies: requests, python-dotenv (for secure credential management).

pip install requests python-dotenv

Authentication Setup

Genesys Cloud uses OAuth 2.0. For server-to-server integrations, the Client Credentials Grant flow is the standard. You must obtain an access token before making any API calls. The token expires in 600 seconds (10 minutes), so your application must handle token refresh or re-authentication.

Step 1: Configure Environment Variables

Create a .env file in your project root. Never hardcode credentials in source code.

GENESYS_CLOUD_REGION=us
GENESYS_CLOUD_CLIENT_ID=your_client_id_here
GENESYS_CLOUD_CLIENT_SECRET=your_client_secret_here
GENESYS_CLOUD_ORGANIZATION_ID=your_org_id_here

Step 2: Implement Token Retrieval

The following Python class handles the authentication flow. It caches the token and checks expiration before requesting a new one.

import os
import time
import requests
from dotenv import load_dotenv
from typing import Optional, Dict

load_dotenv()

class GenesysAuth:
    def __init__(self):
        self.region = os.getenv("GENESYS_CLOUD_REGION", "us")
        self.client_id = os.getenv("GENESYS_CLOUD_CLIENT_ID")
        self.client_secret = os.getenv("GENESYS_CLOUD_CLIENT_SECRET")
        
        if not self.client_id or not self.client_secret:
            raise ValueError("Missing GENESYS_CLOUD_CLIENT_ID or GENESYS_CLOUD_CLIENT_SECRET")

        # Determine the correct auth domain based on region
        if self.region == "us":
            self.auth_domain = "https://api.mypurecloud.com"
        elif self.region == "eu":
            self.auth_domain = "https://api.eu.mypurecloud.com"
        elif self.region == "au":
            self.auth_domain = "https://api.ap.mypurecloud.com"
        elif self.region == "jp":
            self.auth_domain = "https://api.au.mypurecloud.com"
        else:
            raise ValueError(f"Unsupported region: {self.region}")

        self.api_domain = self.auth_domain.replace("api.", "api.") # Usually same for standard regions
        self.access_token: Optional[str] = None
        self.token_expiry: float = 0

    def get_token(self) -> str:
        """
        Retrieves an OAuth access token.
        Returns cached token if valid, otherwise fetches new one.
        """
        # Check if token is still valid (subtract 30s buffer for network latency)
        if self.access_token and time.time() < (self.token_expiry - 30):
            return self.access_token

        url = f"{self.auth_domain}/oauth/token"
        headers = {
            "Content-Type": "application/x-www-form-urlencoded"
        }
        data = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret
        }

        response = requests.post(url, headers=headers, data=data)
        response.raise_for_status()

        token_data = response.json()
        self.access_token = token_data["access_token"]
        self.token_expiry = time.time() + token_data["expires_in"]

        return self.access_token

    def get_headers(self) -> Dict[str, str]:
        """Returns headers required for API calls."""
        return {
            "Authorization": f"Bearer {self.get_token()}",
            "Content-Type": "application/json"
        }

Implementation

Transferring a call in Genesys Cloud is not a “transfer” action in the traditional telephony sense (like SIP REFER). Instead, it is a metadata update. You modify the interaction object to change its target. The platform’s routing engine then picks up this change and re-routes the media accordingly.

Step 1: Identify the Conversation and Target Queue

Before you can transfer, you need two IDs:

1. conversationId: The UUID of the active voice conversation.
2. queueId: The UUID of the destination queue.

You can find the conversationId via the Conversations API or by passing it from your IVR/CTI integration. To get the queueId, you typically query the Routing Queues API.

Finding a Queue by Name

It is rarely efficient to hardcode queue IDs. Use the following helper to resolve a queue name to its ID.

import logging

logger = logging.getLogger(__name__)

class GenesysTransferClient:
    def __init__(self, auth: GenesysAuth):
        self.auth = auth
        self.base_url = auth.api_domain

    def get_queue_id_by_name(self, queue_name: str) -> str:
        """
        Resolves a queue name to its ID.
        Scope: routing:queue:read
        """
        url = f"{self.base_url}/api/v2/routing/queues"
        headers = self.auth.get_headers()
        
        # Pagination parameters
        params = {
            "pageSize": 25,
            "pageNumber": 1
        }

        while True:
            response = requests.get(url, headers=headers, params=params)
            
            if response.status_code == 429:
                wait_time = int(response.headers.get("Retry-After", 5))
                logger.warning(f"Rate limited. Retrying in {wait_time} seconds.")
                time.sleep(wait_time)
                continue
            
            response.raise_for_status()
            
            data = response.json()
            entities = data.get("entities", [])
            
            for queue in entities:
                if queue["name"].lower() == queue_name.lower():
                    return queue["id"]
            
            # Handle pagination
            if params["pageNumber"] >= data["pageCount"]:
                break
                
            params["pageNumber"] += 1

        raise ValueError(f"Queue '{queue_name}' not found.")

Step 2: Construct the Transfer Payload

The core of the transfer is the PATCH request to /api/v2/interactions/conversations. This endpoint updates the interaction metadata. To transfer a call, you must update the routingData within the interaction.

The critical field is routingData.queueId. Setting this field tells the platform to re-evaluate the interaction against the new queue’s routing rules.

Important: You must also ensure the routingData object includes the queueId and optionally wrapUpCode if required by your environment, but primarily queueId drives the transfer.

The Payload Structure

The JSON body for the PATCH request must look like this:

{
  "routingData": {
    "queueId": "00000000-0000-0000-0000-000000000000"
  }
}

If you wish to set a specific skill requirement or priority, you can include additional fields in routingData, but for a simple queue transfer, only queueId is mandatory.

Step 3: Execute the Transfer

This function performs the actual PATCH operation. It includes robust error handling for common scenarios like missing permissions, invalid conversation states, and rate limiting.

    def transfer_call_to_queue(self, conversation_id: str, queue_id: str) -> dict:
        """
        Transfers an active conversation to a specific queue.
        
        Args:
            conversation_id: The UUID of the conversation to transfer.
            queue_id: The UUID of the target queue.
            
        Returns:
            The response JSON from the API.
        """
        url = f"{self.base_url}/api/v2/interactions/conversations"
        headers = self.auth.get_headers()
        
        payload = {
            "routingData": {
                "queueId": queue_id
            }
        }

        # PATCH requires the conversation ID in the query string
        params = {
            "conversationId": conversation_id
        }

        max_retries = 3
        for attempt in range(max_retries):
            try:
                response = requests.patch(
                    url, 
                    headers=headers, 
                    json=payload, 
                    params=params
                )

                if response.status_code == 429:
                    wait_time = int(response.headers.get("Retry-After", 2 ** attempt))
                    logger.warning(f"Rate limited (429). Retrying in {wait_time}s (Attempt {attempt+1})")
                    time.sleep(wait_time)
                    continue

                response.raise_for_status()
                return response.json()

            except requests.exceptions.HTTPError as e:
                if response.status_code == 401:
                    # Token might be expired, force refresh
                    logger.warning("Unauthorized. Refreshing token.")
                    self.auth.access_token = None
                    self.auth.token_expiry = 0
                    headers = self.auth.get_headers()
                    continue
                elif response.status_code == 403:
                    raise PermissionError(f"Forbidden: {response.text}") from e
                elif response.status_code == 404:
                    raise ValueError(f"Conversation {conversation_id} not found") from e
                elif response.status_code == 400:
                    raise ValueError(f"Bad Request: {response.text}") from e
                else:
                    raise

        raise Exception("Max retries exceeded for transfer request.")

Step 4: Verify the Transfer

After the PATCH returns successfully, the transfer is not instantaneous. The platform needs to process the routing change. You can verify the transfer by polling the conversation details.

    def get_conversation_details(self, conversation_id: str) -> dict:
        """
        Retrieves current conversation state.
        Scope: conversation:read
        """
        url = f"{self.base_url}/api/v2/interactions/conversations"
        headers = self.auth.get_headers()
        params = {
            "conversationId": conversation_id,
            "expand": "participants,routingData"
        }

        response = requests.get(url, headers=headers, params=params)
        response.raise_for_status()
        return response.json()

Complete Working Example

This script ties all components together. It authenticates, finds a queue by name, and transfers a specified conversation.

import sys
import time
import logging
from dotenv import load_dotenv

# Import the classes defined above
# Assuming GenesysAuth and GenesysTransferClient are in the same file or imported

def main():
    # Configure logging
    logging.basicConfig(
        level=logging.INFO,
        format='%(asctime)s - %(levelname)s - %(message)s'
    )

    # Load environment variables
    load_dotenv()

    # Initialize Auth
    try:
        auth = GenesysAuth()
        print("Authentication initialized successfully.")
    except Exception as e:
        print(f"Authentication failed: {e}")
        sys.exit(1)

    # Initialize Client
    client = GenesysTransferClient(auth)

    # Configuration
    TARGET_CONVERSATION_ID = os.getenv("TARGET_CONVERSATION_ID")
    TARGET_QUEUE_NAME = os.getenv("TARGET_QUEUE_NAME", "Support-Queue")

    if not TARGET_CONVERSATION_ID:
        print("Error: TARGET_CONVERSATION_ID environment variable is required.")
        sys.exit(1)

    try:
        print(f"Looking up queue: {TARGET_QUEUE_NAME}")
        queue_id = client.get_queue_id_by_name(TARGET_QUEUE_NAME)
        print(f"Found Queue ID: {queue_id}")

        print(f"Initiating transfer for Conversation ID: {TARGET_CONVERSATION_ID}")
        
        # Execute Transfer
        result = client.transfer_call_to_queue(TARGET_CONVERSATION_ID, queue_id)
        
        print("Transfer request accepted.")
        print(f"API Response: {result}")

        # Optional: Poll for confirmation
        print("Waiting 3 seconds for routing engine to process...")
        time.sleep(3)
        
        details = client.get_conversation_details(TARGET_CONVERSATION_ID)
        current_queue = details.get("routingData", {}).get("queueId")
        
        if current_queue == queue_id:
            print("SUCCESS: Conversation is now routed to the target queue.")
        else:
            print(f"WARNING: Conversation queue ID is {current_queue}. Transfer may still be processing.")

    except ValueError as e:
        print(f"Validation Error: {e}")
    except PermissionError as e:
        print(f"Permission Error: {e}")
    except Exception as e:
        print(f"Unexpected Error: {e}")

if __name__ == "__main__":
    main()

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: The OAuth token has expired, or the client credentials are invalid.
• Fix: Ensure your GenesysAuth class is refreshing the token. If using the raw API, check that you are passing Authorization: Bearer <token> correctly. Verify the token in the Genesys Cloud Admin Console under Users > Integrations > Private Integrations.

Error: 403 Forbidden

• Cause: The OAuth client lacks the required scopes.
• Fix: Go to Users > Integrations in the Genesys Cloud Admin Console. Select your integration. Ensure the following scopes are checked:
  • conversation:write
  • interaction:write
  • routing:queue:read
• Note: Changes to scopes take effect immediately for new tokens but may require a token refresh for active sessions.

Error: 400 Bad Request

• Cause: The conversation is not in a transferable state, or the payload is malformed.
• Fix:
  • Check if the conversation is already ended (state: ended). You cannot transfer an ended conversation.
  • Ensure the conversationId is a valid UUID.
  • Verify that the queueId in the payload exists and is active.
  • Check if the conversation is currently in a “Transfer” state from a previous attempt. You may need to cancel the previous transfer or wait for it to fail.

Error: 429 Too Many Requests

• Cause: You have exceeded the API rate limits for your organization.
• Fix: Implement exponential backoff. The Retry-After header in the response indicates how many seconds to wait. The provided code handles this automatically.

Error: Transfer Not Taking Effect

• Cause: The routing engine has not yet processed the update, or the agent was already connected.
• Fix:
  • If the agent is already connected, the transfer will fail silently or require a “Consultative Transfer” flow. For blind transfers, the conversation must be in queued or wrapup state (depending on configuration).
  • Poll the conversation details every 2-5 seconds to check the routingData.queueId.
  • Ensure the target queue has available agents or is configured to accept calls.

Official References

• Genesys Cloud Conversations API Documentation
• Interactions API: Patch Conversation
• OAuth 2.0 Client Credentials Grant
• Routing Queues API