curl --request POST \
  --url https://orbitflare.com/api/customer/v2/invoices/{invoice}/pay-with-balance \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "message": "<string>",
  "data": {
    "balance_used": 123,
    "remainder": 123,
    "invoice_status": "<string>",
    "new_user_balance": 123
  }
}