Setting up your WhatsApp Business Account’s payment method is necessary to start sending WhatsApp marketing campaigns and growing your business.
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In Business Manager, go to the Overview page, find the account that you want to add the payment method to (1), click the 3-dot icon (2), and click Manage account settings (3).
In the Settings tab, click Payment Settings.
In the Payment settings page, click Add Payment method.
Follow the instructions to add your payment information and click Next.
Add card details and click Save.
In the Payment settings page, click Edit.
Follow the instructions to add your business information and click Save.