SalesForce Apex SOAP Callout to External Endpoint - soap

Any help would be appreciated.
I am trying to have SalesForce push out account information to a billing system (external) via a SOAP API. The billing system doesn't have a WSDL that I can generate an Apex Class with and I have been scouring the net for information on how to create a class without a WSDL.
Q: Is it possible to interact with an external SOAP without a WSDL? And if it is possible can someone point me to some examples?
Thanks!!
--Nick

You have a few choices:
Reverse engineer a WSDL from the billing system.
Skip the WSDL and generate your own stub classes. See this part of the docs for an example.
Generate your own SOAP messages and use the HTTP classes to invoke

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