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Callouts From Managed Packages

Hello all,


I have read the postings that I could find on this issue, but I am wondering if someone can help me understand better...We are making a managed package that must call out to external web services of the customer's ERP systems (that are not yet created!). The customer would have to implement these web services in their external systems and provide our package the information to call out to them.


1. What is the best way to implement this within our package?


2. How do we provide them a description of the services we need on their end (a WSDL) to aid in creating the services?


Please also let me know if I have the whole thing all wrong!?! Any help is greatly appreciated here!