Purchase phone number

Initiate purchasing a WhatsApp phone number. Payment-first flow: the user does not pick a specific number. The system either creates a Stripe Checkout Session (first number) or increments the existing subscription quantity and provisions inline (subsequent numbers). Requires a paid plan. The maximum number of phone numbers is determined by the user's plan.

curl -X POST "https://zernio.com/api/v1/whatsapp/phone-numbers/purchase" \  -H "Content-Type: application/json" \  -d '{    "profileId": "507f1f77bcf86cd799439011"  }'

{
  "message": "string",
  "checkoutUrl": "http://example.com"
}

{
  "error": "Unauthorized"
}