My father owns a company and everyone working there has a company credit card where they use it to purchase stuff for the company and even use it to purchase gas for their own cars as that is a benefit of working there. Would it be allowed for me to use the credit card to buy gas? I work there.

The problem is using credit cards in disbelieving countries because it involves riba (usury). However, the scholars gave the fatwa that if it is extremely difficult to go around without a credit card, and it is necessary to have one in order to pay, then with certain criteria you can use it. This is provided that you do not fall into late fees and the increase of riba.