CRM 5.0 / User-exit for Tax Interface to Vertex

Does any body know of any RFCs, BADIs or User-exits in CRM 5.0 to provide some parameters to Vertex Tax Software? Currently we are implementing a B2C webshop and we need to pass the following information to Vertex in order to calculate the correct tax rates:

Company Code

Customer Number

Tax Jurisdiction of Ship From

Tax Jurisdiction of Order Location

Tax Classification of Customer

Freight Amount

Can anybody help? Thanks!