For more information on embedding a chat in iFrame, read this guide.
In your website, where you want to place the chat iFrame add:

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Note:
If you are using Identity Verification in our web chat you need to pass the uniqueIdentifier and identityToken as parameters.

Parameters

Name	Type	Description	Default Value
apiKey	string	Mandatory
snippetId	string	If you have more than one script for your department
culture	string		en-US
participantName	string
participantPhoneNumber	string
field1	string	Optional dynamic parameter value
field2	string	Optional dynamic parameter value
field3	string	Optional dynamic parameter value
field4	string	Optional dynamic parameter value
uniqueIdentifier	Guid	If your visitor is uniquely identified, this will override our cookie. Relevant if you are using Identity Verification
identityToken	string	Relevant if you are using Identity Verification