Terminal checkout request fails for tip only payment

The use case here, is that a customer is purchasing items, but they have also been given a discount that actually lowers the total amount due down to zero. However, the customer is still given the option to provide a tip amount.

If we try process this scenario using Square’s Terminal “Checkout” API to take payment on a Square Terminal device, we immediately get an error back:

{
  "errors": [
    {
      "code": "BAD_REQUEST",
      "detail": "amount must be > 0",
      "field": "amount_money.amount",
      "category": "INVALID_REQUEST_ERROR"
    }
  ]
}

NOTE: We have verified that it is possible to apply this kind of tip only payment to a Square Order using the Payments API. We just can’t seem to take a tip only payment using the Terminal API and a Square device.

Any help or guidance would be greatly appreciated.

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