Is it impossible to generate a SOAP API using a WSDL file or URL in WSO2 API Manager?

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No, it is not impossible to generate a SOAP API using a WSDL file or URL in WSO2 API Manager. In fact, WSO2 API Manager provides this functionality out of the box. You can easily create a SOAP API by importing a WSDL file or URL through the API Manager's web-based interface. Once the API is created, you can manage its lifecycle and security policies just like you would with a REST API.