Helga, when we signed up with them and I filled out their vendor package, they gave me a vendor id number. On their web site, you sign in with your vendor # and a password.  I will email you directly with the phone numbers I have and other info. 
I can tell you, when you bill them, you have to include their order number, last name of borrower, address, county and state and your fee for each order completed.  I also include my file number too, in case they call with a question.  The girl in billing is Bernadette. 
I also just want to make mention to everyone that according to my vendor coordinator, when they re activated us the system did't 'take it', so she re activated us again when I asked them to.  SO she went ahead and did so Thursday and we have received several orders already from them. Apparently there was a glitch in their system somewhere.