The WhatsApp API is a paid service, and Meta charges a small fee per conversation for messages sent and received through the API. To cover these charges, you must add a payment method in the Meta Business Portal.
Follow the steps below to add your payment method.
1. Open Meta Business Settings page.
2. If prompted to select a Business account, choose the one you previously set up for WhatsApp Cloud APIs.
3. Next, navigate to the left sidebar and go to Accounts > WhatsApp Accounts. Then, select your WhatsApp account from the list.
4. Then, click on the Settings tab, followed by the Payment Settings button.
5. On the Payment Settings page, complete the following two actions:
1. In the Payment methods section, click on Add payment method button and add your payment method.
2. In the Business Info section, click the Edit button and enter your legal business details.
Important Note: If you are an Indian business, adding a GST number in the Business Info section is mandatory. Without it, you won’t be able to use the WhatsApp API
You’ll see a screen like the following after your payment method is added successfully: