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API Endpoint v21.0 versus v43.0
The Enterprise WSDL and Partner WSDL endpoints are below.
Enterprise: <soap:address location="https://test.salesforce.com/services/Soap/c/43.0/OrgID"/>
Partner: <soap:address location="https://test.salesforce.com/services/Soap/u/43.0/OrgID"/>
Question: If the system that's looking to connect to Salesforce can only support API v21.0, I'm assuming that the endpoint simply changes to the following however, how can I understand what obstacles to anticipate between the two versions?
<soap:address location="https://test.salesforce.com/services/Soap/u/21.0/OrgID"/>
Enterprise: <soap:address location="https://test.salesforce.com/services/Soap/c/43.0/OrgID"/>
Partner: <soap:address location="https://test.salesforce.com/services/Soap/u/43.0/OrgID"/>
Question: If the system that's looking to connect to Salesforce can only support API v21.0, I'm assuming that the endpoint simply changes to the following however, how can I understand what obstacles to anticipate between the two versions?
<soap:address location="https://test.salesforce.com/services/Soap/u/21.0/OrgID"/>
Lets suppose if you have an new object in 43 version whihc not there in 21.0 it will fail