APIs to connect WhatsApp and phone calls to your business systems
When your CRM, ERP or website talks directly to your communication tools, messages and calls go out on their own and the results come back to your system. Understand how it works, without the jargon.
Published on November 7, 2026 · 7-minute read
What an API is, in plain language
An API is the entrance one system offers for another system to use. Instead of a person opening the dashboard and clicking “send”, your company's system makes a request over the internet, such as “send this message to this customer”, and gets the answer right away.
An everyday example: when you pay for an online purchase, the store uses the payment provider's API. You do not see it, but the two systems are talking.
And what are webhooks?
The API is your system asking for something. The webhook is the way back: the platform notifies your system when something happens. For example, “the message was read”, “the customer confirmed the appointment” or “the agent classified the call as a sale”.
Without a webhook, your system would have to keep asking whether anything changed. With one, the update arrives on its own, in seconds.
The problems integration solves
- Spreadsheets exported and imported every day to build sending or calling lists.
- Late messages, because they depend on someone remembering to send them.
- Mismatched information: the customer confirmed on WhatsApp, but the CRM does not know yet.
- Typing errors in phone numbers, names and dates.
- A busy team doing repetitive tasks instead of serving and selling.
Automation examples
| When it happens | What goes out automatically | What comes back |
|---|---|---|
| Sale approved in the store or ERP | Order confirmation on official WhatsApp | Message delivery and read status |
| Appointment booked in the clinic's system | Reminder with Confirm, Cancel and Reschedule | The patient's reply |
| Invoice close to its due date | WhatsApp reminder and, if your system decides, entry into an outbound IVR campaign | Reads, replies and call results |
| Form filled in on the website | The contact joins the active dialer campaign | The classification made by the agent |
| Support completed | The contact joins the phone survey campaign | Scores in the reports |
HiperZap API (official WhatsApp)
- Sends messages with Meta-approved templates, with each contact's variables.
- Checks whether each message was delivered and read.
- Creates and updates contacts and tags.
- Checks available times and books, reschedules or cancels appointments in the schedule.
- Notifies your system when a message changes status, when the customer replies or taps a button and when an appointment is confirmed, cancelled or rescheduled.
- In the dashboard, you pick a template and copy the ready-made call in cURL, JavaScript, PHP, Python or JSON.
Whatever goes out through the API follows the same rules as the dashboard: approved template, sending only to people who opted in, allowed hours, block list and prepaid credit. The API is contracted separately.
Meu Call Center API (phone calls)
- Sends contacts to active auto dialer, outbound IVR or phone survey campaigns.
- Looks up and updates contact data.
- Lists campaigns and looks up completed calls.
- Notifies your system when an agent classifies a call, when a contact import finishes and when the account status changes.
The API does not place a one-off call on the spot: the contact joins the campaign, and the call follows its rules, such as hours, attempts, block list and, in the dialer, available agents.
Security: what to look for in any API
- An individual access key, shown once and revocable at any time.
- Permissions by area, so each key does only what it needs.
- A limit on calls per minute, which protects the account against misuse.
- Signed notifications, so your system can confirm the webhook really came from the platform.
- HTTPS only.
The HiperZap and Meu Call Center APIs have all these safeguards. One rule applies to any system: never put the access key on a public website or in an app installed on the customer's phone. It should stay only on your company's server.
Which systems can be integrated
Both APIs follow the REST standard, with JSON over HTTPS. Any system that can make these calls can connect: CRMs, ERPs, online stores, clinic systems, in-house apps and automation tools.
There is no ready-made connector for every system on the market. The connection is built by your company's technical team, your system's vendor or an automation tool, using the documentation available in each platform's dashboard.
How to get started
- List what should happen automatically. Start with a single automation, the one that takes up most of your team's time.
- Talk to our team to confirm the API covers what you need.
- Enable the feature and create the key in the platform's dashboard.
- Integrate and test with a few contacts before going live.
- Register the webhook address so the results come back to your system.
FAQ about WhatsApp and calling APIs
Do I need a developer to use the API?
Yes, integration is technical. It can be done by the company's IT team, your system's vendor or an automation tool that can send and receive HTTP calls.
Can I send any message on WhatsApp through the API?
No. Messages started by the company use Meta-approved templates and can only go to people who opted in, the same rules as campaigns created in the dashboard.
Where is the documentation?
In each platform's dashboard, in the API or Integrations area, available to the account administrator. That is also where access keys are created and webhook addresses are registered.
Shall we automate your operation?
Tell us which systems your company uses and what should happen automatically.