SendTransactionPayModalConfig
 Configuration for the "Pay Modal" that opens when the user doesn't have enough funds to send a transaction.
Set payModal: false  to disable the "Pay Modal" popup
This configuration object includes the following properties to configure the "Pay Modal" UI:
 The language to use for the "Pay Modal" UI. Defaults to "en_US" .
 An object of type SupportedTokens  to configure the tokens to show for a chain.
 The theme to use for the "Pay Modal" UI. Defaults to "dark" .
 It can be set to "light"  or "dark"  or an object of type Theme  for a custom theme.
 Refer to lightTheme 
or darkTheme  helper functions to use the default light or dark theme and customize it.