In older editions of OIC while connecting to Salesforce we need to save and upload Enterprise WSDL, however this process has changed now.
Its better to create developer account using https://developer.salesforce.com/signup as this developer edition of Salesforce provides more in aspect to Development capabilities.Once Done we need to do few things :-
Search ‘API’ in Quick Find and hit ‘Generate Enterprise WSDL’. Read the complete article here.
For regular information on Oracle PaaS become a member in the PaaS (Integration & Process) Partner Community please register here.
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