Ask HN: Recommendations for Large Ticket B2B Credit Card Processors?

Does anybody have experience with this? We are a B2B company that needs to process large tickets, with an average ticket amount of $90,000 and a high ticket amount of approximately $500,000. From my research, it seems that this is a very niche industry for these types of transactions. I figured I’d reach out to see if anyone is already doing something similar and needed to find an ideal credit card processor for their needs. Thank you in advance.