Postman is a great tool to allows you to experiment with APIs, such as the ones we provide as part of Check Point Infinity. Peter Elmer wrote a nice document on how to do exactly that. What do you plan to build with our APIs?
For those who recently upgraded to R80.10 from R77.x, the inability to switch between Read Only and Read/Write mode is worth noting. It's not as much of an issue as it was in R77.x, though, given multiple users can login with Read/Write mode.
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Good discussion about how these two features interact.