Permissible and Impermissible employment

Q: I am a software developer and two weeks ago my friend asked that he has signed a deal with his client for an android app that we need to deliver within 30 days. My friend and his client both are very trusted although the client is a non-Muslim. So what happened is neither he saw the project details nor me and after two week now when I started working on the project I realized that it was a betting app. Me and my friend both are very stressed that should we take the money from this app or not? Since he has transfered the money into our bank account, what should we do?

Q: I work for company called NEXT who’s CEO has political support for Israel.

Also the company provides a credit card for the customers which has interest in it as well. As I work as a sales girl I have to be on the counter/till while on the till sometimes I have to take the credit cards from the customers as their means of payment.

Can you please tell me if my earning is halaal?

Q: Is it permissable for one to collect funds on behalf of doctors from medical aid companies and debtors and charge a fixed percentage to the doctor for your services. 

Q: Is it permissible to work for a clothing store that sells shirts with pictures of animate objects, such as humans and animals? Not all the shirts have these objects but some do. Would the earnings from being a sales associate at such store where one greets customers, puts the clothing on the shelves, works the cash register, etc be halal?

Q: Is it permissible to work as a Finance Manager in a manufacturing company whose financing lines are all from interest based banks and the Finance Manager would have to be leading this activity of arranging loans, managing them and recording them?

Q: Is it permissible for an anaesthetic doctor to work with a plastic surgeon who may do cosmetic surgery i.e a patient is booked for cosmetic surgery and the anaesthetist will be required to put the patient to sleep for the procedure?

Q: Is it allowed for a Moulana, Mufti, Shaikh to take money for giving dawah/speech? In our country they take money for giving Islamic speeches! Is it allowed in Islam? If yes then what is the reason?

Q: My husband is doing 2 jobs at a time. While it's the rule of the first company to not join another one. Is the pay from the other job halal?

Q: I have been working as social media marketeer in spotify, youtube, where I take artist song/content link and make a deal to promote it without dealing on lyrics. When the result is done I get paid. Is it haram? Is my income haram?

Q: I work as a mechanical product designer. Recently a new project came to me, actually it will be an alcohol dispenser. This product is specifically designed for alcohol. I want to ask if it is permissible to design this product as a Muslim?