How do I contact booking.com via email

May I know what is the email address I can send to for any problem encounter as a business partner affiliate?

Is there a customer service landline that I can call to speak to? My business property is in Egypt.

I am abit confuse on registration log in here. Is there 2 types of booking.com registration? One for as customer and the other one is booking.com partner hub registration?

best regards,

Hamada