If you have the on-premises version of iSpring LMS, download the WSDL file for the SOAP API from your iSpring LMS. account.
To download the file, add https://your account domain/downloads/api_2.0.wsdl to your account URL.
Suppose that your iSpring LMS domain is lms.company.com. In that case, you would download the file that is stored here: https://lms.company.com/downloads/api_2.0.wsdl.