For developers managing large-scale customer databases, identifying communication preferences is a critical step in optimizing outreach. Knowing whether a contact is reachable via a standard WhatsApp account or a WhatsApp Business account allows for more precise segmentation and channel selection.
This guide walks through the implementation of an asynchronous pipeline using the WhatsApp Business Checker API to verify account registration at scale.
Understanding the Workflow
The WhatsApp Business Checker API operates on an asynchronous batch model. Instead of waiting for a single request to complete, you submit a file, poll for its status, and retrieve the final results once the task is marked as exported.
1. Preparing Your Data
Normalization is key to ensuring high match rates. Prepare your input as a plain text file with one phone number per line, ideally in E.164 format (e.g., +14155552671).
2. Initiating a Task
To start the verification process, send a POST request to the /v1/tasks endpoint. You must include your X-API-Key header and specify the task_type as ws_business.
curl --location 'https://api.checknumber.ai/v1/tasks' \
--header 'X-API-Key: YOUR_API_KEY' \
--form 'file=@"./input.txt"' \
--form 'task_type="ws_business"'
The API will return a task_id. Store this identifier, as it is required to track the progress of your batch.
3. Monitoring Task Status
Since the process is asynchronous, you should implement a polling mechanism to check the task status using the /v1/gettasks endpoint.
- Pending/Processing: The task is currently being evaluated. Do not treat these states as final.
-
Exported: The task is complete. You can now access the
result_urlprovided in the response.
curl --location 'https://api.checknumber.ai/v1/gettasks' \
--header 'X-API-Key: YOUR_API_KEY' \
--form 'task_id="d4g8o46p2jvh04o9uolg"'
4. Handling Results
Once the status reaches exported, the response will contain a result_url. Download the file from this URL to access your processed data. Each row in the resulting file will contain:
-
number: The original phone number. -
whatsapp: A flag indicating if the number is registered on WhatsApp. -
business: A flag indicating if the number is registered as a WhatsApp Business account.
Observability and Best Practices
-
Check Task Status: Always verify the status field before attempting to parse the result file. Ensure your logic handles the
exportedstatus specifically. -
Error Handling: Be prepared for HTTP status codes such as
400(invalid file) or503(temporary maintenance). Implement a retry strategy that respects the service's operational state rather than aggressive polling. -
Downstream Integration: Preserve the column names provided in the exported file to ensure your internal data pipelines map the
whatsappandbusinessfields correctly.
For detailed information on request limits and integration boundaries, refer to the official documentation.
Conclusion
By decoupling the submission of your data from the retrieval of results, you can efficiently process large lists of phone numbers without blocking your primary application threads. This asynchronous pattern ensures your system remains responsive while handling intensive validation tasks.
This article was drafted with AI assistance and reviewed before publishing.
