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## Checkout validation and API
This module contains functions to validate and mask checkout form fields such as credit card fields.
## API
### `validatePaymentDetails( paymentDetails, paymentType )`
Returns an object containing the errors for each field. For example the returned object might look like this:
```js
const error = {
number: [ 'Invalid credit card' ],
};
```
If there are any missing fields, there are no errors for that field.
### `getCreditCardType( number )`
Returns credit card brand for a given card number
### `maskField( fieldName, previousValue, nextValue )`
Returns a masked input value for the given field based on the current value and the next value to replace it with.
### `unmaskField( fieldName, previousValue, nextValue )`
Returns an unmasked input value that is meant to be used within the program rather than displayed to the user.
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