Pre-requisites for getting started with Pact Contract Testing

Our organisation team structure is such that there is a separate team of testers who is supposed to do API Testing. So as a member of this team, I donot have java code setup for every API project. 1) So how can I write Consumer driven tests in that case? 2) Or do I need to setup every consumer java project before i start testing? 3) Or do I need to request all the API providers/consumers about this framework and ask them to implement the same.

Currently, the testing is limited to manual testing via Postman and Unit Testing by developers.

Thanks