Questions about developing game apps

He got a promotion at work via bribery. Is his salary haraam?

The ruling on using the company phone for personal matters, if there is usually some credit left at the end of the month

Ruling on studying information technology (IT) in a non-Muslim country, and the ruling on working in this field in that country

He works as a doctor, and people come to him to ask for sick notes, describing their symptoms, but they may be lying

His boss is going to give him the price of the ticket; if he gets points for using his Visa card, does he have to tell his boss about that?

Ruling on an accountant entering invoices for alcohol sales into the accounting system

His company did a contract with him to do some work in return for a percentage of the profit, in addition to his original work for which he receives a salary