How do I pay Meta for WhatsApp messages in India with UPI?

In India, add funds by UPI and your WhatsApp account goes on prepaid billing. Saving a card puts it on invoiced billing instead, and you cannot change the choice later.

• Prepaid billing is available in India.
• UPI funds mean prepaid billing. A saved card means invoiced billing. The choice cannot be changed afterwards.
• Prepaid is not offered to Meta Business Agent accounts or accounts billed through a provider's credit line.
• A message can show as accepted and still fail with error 131042 when funds are not enough. Keep your balance topped up.