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Put yourself in the customer's Shoe.
See what would you like to have if you were the in his place.
Don't offer the customer things that are useless just to gain quick money as he will know after some time and you will lose more
Don't assume just Ask ? Don't assume the decision-maker just Develop your relations with all. Search and stress in your Account needs. Win To Win Concept. Think out the box. Don't forget Coworker relation development.