SOAP API with the Partner WSDL is a method of integration that can be used to create, retrieve, and update common object records in all of the different orgs. SOAP API is a web service that can be used to access Salesforce data and functionality from any programming language that supports SOAP, such as Java. The Partner WSDL is a type of WSDL (Web Service Description Language) file that can be used to generate SOAP client classes that are loosely coupled to the Salesforce metadata. The Partner WSDL can handle different objects and fields in different orgs, and can dynamically discover the schema at runtime. By using SOAP API with the Partner WSDL, the developer can create a single Java application that can interact with any Salesforce org, regardless of the object and field differences. Reference: [SOAP API], [Partner WSDL]