Sentence:  I wouldn't promote businesses I considered immoral – ambulance-chasing lawyers or online roulette for example – but I've got nothing against computer or software manufacture: they're important and any reputable company in that industry is welcome to <WSD>treat</WSD> for my services. 
Meaning of the word marked with <WSD> tags:  To negotiate, discuss terms, bargain ("for" or "with"). (from 13th c.)