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WhatsApp Account Model Evolution

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WhatsApp Business Accounts split into a WhatsApp Account (WAC) that holds the phone number and a Paid Messaging Account (PMA) that holds templates and billing, allowing one number to be shared concurrently across multiple partners while keeping billing per PMA. Migration is automatic. Embedded Signup returns the messaging account ID in the existing WABA ID field. Cloud API adds an optional paid_messaging_account_id parameter required only when multiple PMAs share one WAC. Full backward compatibility runs through H1 2028.

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