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KPI based syatem integration with salesforce

We are working on integrating salesforce with customized (in dot net/php) third party system which is KPI(key performance indicators) based.
We have to develop third party system.
We need to fetch the user details like how many opportunities he has created,no of calls,no of closed won, no of leads converted etc.
what should be the steps:
Should salesforce dev to give wsdl to the dot net developer? or some other steps also involved. like which apis? or only WSDL file is sufficient.

Thanks in advance for the help!!