Nothing unexpected, HR will actually tell you what to expect but here is the summary (all interviews were 45-60 minutes, with 5-10 minutes left for questions from the candidate).
Video-conference on product execution - classic execution, how to measure success of product x, north star metric for y, how do you move the metric, how do you set goals, metric x is going up/down why
interview with engineering manager - focused on figuring out how you work with engineers, technical understanding of products you built, why you made some of the technical choices, how do you remove roadblocks, how do you push back against engineers etc.
interview with design manager - focused on how you think about products from a design perspective, product you like/dislike and why, how to improve a stripe product from a design perspective, how would you design a product for x (could be anything, try to be as specific and clear as possible)
interview with PMs - focused on Product Sense, a little bit about previous work but mostly focused on why you like/dislike a product, how to improve x, how to improve adoption of a Stripe product, if you built app y from scratch what/how would you build?
interview with hiring manager - questions about your weaknesses and strengths as they relate to product management [do not BS and say things like "I am too perfectionist", they are looking for honest self-reflection], how you improve/leverage them with examples, questions about managerial style and how you set people up for success (again be thoughtful, no BS), some generic estimation/root cause question about a tech product (uptick [pick an action] for product x in a given locale for a given week, why?)
interview with data scientist - a little bit about relationship with the analytics team but mostly focused on how to make a product decision using data. you are expected to go deep on a particular problem - should we change feature x in some stripe product, here is the change in the metrics, how do you make the decision? brush up on your stats.
general advice: Stick to a clear structure/logic when answering ambiguous questions and be clear about what/why you are building something. be humble - the people interviewing you are really thoughtful, intelligent and humble. humility is high valued.