Configure the Swap Customer Setup user journey

The following parameters can be used to customize the widget user journey that sets up the customer for the API Swaps flow.

Parameter	Description
`apiKey` required	Your publishable API key. This is used to assign customers and transactions to your MoonPay account.
`amount` required	The amount the customer wishes to swap - in fiat. You can get this amount by multiplying the amounts you get back from the Swap quote endpoint: `baseCurrencyPriceInUsd` * `baseCurrencyAmount`.
`amountCurrencyCode` required	The fiat currency code of the amount parameter, usually `usd`.
`externalCustomerId`	An identifier you would like to associate with the customer. This identifier will be present whenever we pass you customer data, allowing you to match our data with your own existing customer data.
`theme`	Enable dark mode or light mode as the default appearance for the widget. Possible values are dark, light.
`themeId`	ID of the theme created for your application or website. See Themes page.