> ## Documentation Index
> Fetch the complete documentation index at: https://docs.guile.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Contactless Payment Device Unsupported

> The device cannot be used for contactless payments

## Cause

The device or app build cannot run Guile's contactless terminal flow. Guile rejected registration before any payment was created.

## Fix

Register from a supported device and app version with [register a terminal](/api-reference/payments/register-a-terminal).

## Retry safety

Not retryable until the underlying state or request changes.

## Raised by

These operations can return this problem:

* [Register a terminal](/api-reference/payments/register-a-terminal)

## Example

```json theme={null}
{
  "type": "https://docs.guile.app/problems/contactlessPaymentDeviceUnsupported",
  "title": "Contactless Payment Device Unsupported",
  "status": 422,
  "detail": "The device or app build cannot run Guile's contactless terminal flow. Guile rejected registration before any payment was created."
}
```