# Challenge

Enum · GraphQL API

A list of challenges that are required by the current merchant to process a given credit card.

## Values

- `CVV`
- `POSTAL_CODE`

## Used by

- [ClientConfiguration](/braintree/graphql/reference/types/client-configuration) — Object; challenges
- [CreditCardConfiguration](/braintree/graphql/reference/types/credit-card-configuration) — Object; challenges

## GraphQL definition

```graphql
enum Challenge {
  CVV
  POSTAL_CODE
}
```

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[View the complete GraphQL schema on GitHub](https://raw.githubusercontent.com/braintree/graphql-api/refs/heads/master/schema.graphql)