Set Up a Sandbox Account for Calling

• Initiate and receive calls using the Calling API
• Validate calling webhook events
• Simulate onboarding flows without creating real business assets

1. In the App Dashboard⁠, navigate to your app, then select WhatsApp > Embedded Signup Builder in the sidebar.
   • Note: Keep this tab open and available as you will use it multiple times throughout this process.
2. Ensure that the Features dropdown is empty, then click Login with Facebook.
3. A popup with the embedded signup experience will show. Under Business portfolio select Sandbox Business.
4. Fill in the rest of the required information, then click Next.
5. On the next screen, in the Create or Select a WhatsApp Business Profile dropdown, select Test Number.
6. Once the login flow is complete, in the Exchange Token section, click Get Token.
   • Note: Retain this token for future sandbox account API use.
7. In the Fetch Shared WhatsApp Business Account section, click Fetch WABA details.
8. Under WhatsApp business account field, copy the Value for the id row.
   • Note: Retain this ID since it is the WhatsApp Business Account ID for the sandbox WABA.
9. In the Fetch phone numbers section, click Fetch phone numbers.
10. Under ID, copy the value.
    • Note: Retain this ID since it is the phone number ID for your sandbox account test phone number.

• Your sandbox account token string
• Your sandbox account WABA ID
• Your test phone number ID

• Note: Keep this window open as you will use the configuration you created again in later steps in this guide.

1. Navigate to the Graph API Explorer tool⁠.
2. Ensure you are on the latest version of the API.
3. Click Generate Access Token and follow the prompts.
4. Under Permissions, add the whatsapp_business_management and whatsapp_business_messaging permissions
5. In the endpoint builder, enter /<YOUR_SANDBOX_WABA_ID>/subscribed_apps, then click Submit.

{
  "success": true
}

1. Next, register your test phone number by entering /<YOUR_SANDBOX_TEST_PHONE_NUMBER_ID>/register in the endpoint builder.
2. In the left sidebar, click JSON, then enter the following JSON body, then click Submit:

{
  "messaging_product": "whatsapp",
  "pin": "123456"
}

1. You should receive a standard success response:

{
  "success": true
}

1. In the Graph API Explorer tool⁠, enter /<YOUR_SANDBOX_TEST_PHONE_NUMBER_ID>/messages in the endpoint builder.
2. In the left sidebar, click JSON, then enter the following JSON body, then click Submit:

{
  "messaging_product": "whatsapp",
  "to": "YOUR_NUMBER", // Replace this value with phone number of your device.
  "type": "template",
  "template": {
    "name": "hello_world",
    "language": { "code": "en_US" }
  }
}

1. You will receive a response with a "message_status": "accepted" value, and you should receive a text message on your device.

• Navigate to the App Dashboard⁠.
• Click the app you are using with WhatsApp.
• Select Use cases (pencil icon) from the sidebar.
• Under Connect with customers through WhatsApp, click Customize.
• In the left sidebar, click Configuration.
• Under Callback URL, add the callback URL for your webhook server.
  • If you do not have a webhook server, you can follow our instructions to create a test webhook server.
• Under Verify token, add an arbitrary verification string.
• Click Verify and save.
• On the next page, in the Select product dropdown, click WhatsApp Business Account.
• Under Webhook fields, in the calls row, click the toggle button to subscribe to the calls webhook field.

1. In the Graph API Explorer tool⁠, enter /<YOUR_SANDBOX_TEST_PHONE_NUMBER_ID>/settings in the endpoint builder.
2. In the left sidebar, click JSON, then enter the following JSON body, then click Submit:

{
  "calling": {
    "status": "ENABLED",
    "call_icon_visibility": "DEFAULT",
    "callback_permission_status": "ENABLED"
  }
}

1. You should receive a standard success response:

{
  "success": true
}

1. Finally, under Access Token, copy the access token down for future use.
   • Note: Retain this access token as you will use it to make API calls for testing your Calling API integration.

1. On your client device, open WhatsApp.
2. Navigate to the message thread you have with your sandbox business phone number.
3. At the top of the screen, tap the sandbox business phone number.
4. Scroll down and tap Business Calling Permission.
5. Tap Allow calls.

1. On your client device, open WhatsApp.
2. Navigate to the message thread you have with your sandbox business phone number.
3. Tap the phone icon at the top of the screen to call the sandbox business phone number.
4. Confirm a successful call connection.