---
title: externalIdentifier
framework: applepayontheweb
role: symbol
role_heading: Instance Property
path: applepayontheweb/applepaypaymenttokencontext/externalidentifier
---

# externalIdentifier

An external identifier for the merchant.

## Declaration

```data
required DOMString externalIdentifier;
```

## Discussion

Discussion An external identifier for the merchant that the developer provides. If you request a payment token for another merchant, always use the same external identifier for that merchant on your website.

## See Also

### Specifying the merchant

- [merchantIdentifier](applepayontheweb/applepaypaymenttokencontext/merchantidentifier.md)
- [merchantName](applepayontheweb/applepaypaymenttokencontext/merchantname.md)
- [merchantDomain](applepayontheweb/applepaypaymenttokencontext/merchantdomain.md)