Mastercard Software Engineer interview questions

Initial call from HR regarding an opening. No contact for three weeks. Then calls again for another position. 1. General Discussion. Mentioned the salary they can offer. I said I might want something higher than that. They said we can discuss it once you are done with the interview but they said "I would be okay with less pay once I got the offer" , not sure what led them to that assumption :) 2. Call with hiring manager. 3. Interview with the dev team. 4. Call from recruiter to discuss the salary expectations. Mentioned the expectations, slightly higher than what was suggested. No negotiation, the compensation is fixed, offered good benefits. The recruiter had a confrontational tone. Said, they would call after discussing with HM. No call, got a rejection after sometime.