Applied online, HR call for 30 mins, Mini-case 1 hr., Power Day 4 hours.
Until this, they trust your resume and move on without validating your financial/banking/payments skills.
Skill interview on power day you can pick any product.
Case interviews: If you are consultant, you can get these thru. Lots of calculations, assumptions. They prefer you do mental math.
Time management is way important and if you think you solved the case, well there are at least 4-5 parts to it.
Another problem is interviewer; they can just say the problem in 1 sentence and with low voice and ask you questions around it. how impatient they are, good luck with that! Some people genuine want to help you succeed while other just don't care, VP and above, don't care they don't want to get you in.
Basically, you can manipulate your way in with good case tactics and storytelling. Don't assume you know banking/payments/finance more, doesn't matter.