I was developing a project that also featured automatic payment to specific sites. I asked for a dummy credit card and he insisted I use the company's credit card. Who would ever want to give a developer actual credit card credentials for development!? I was a junior dev back then. Of course, I failed once. I got told off because I wasted money. My team leader defended me and said this is the risk of having projects with payments. I got proof I asked for a possible sandbox for payment or whatever that will work for development. Almost got fired. Because of that incident, I'm not comfortable working with projects dealing with payment that doesn't have sandboxes.