A hint for #1: don't assume a "like" is a like.

The default emoji in a conversation can be changed by either side, on demand. So don't be surprised if suddenly you start getting a scared cat, or a tomato, instead of a 369239263222822. Why would people change the default emoji when talking to a bot? Why not?

Hint #2: default emojis can be sent in several sizes, depending on how long the user holds the "send emoji" button. From what I can tell, 369239263222822 is a small like. There are at least two other sizes. This is not some obscure feature, people use it all the time, so be prepared.

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In general, it's worth to pay attention to details of the platform one's developing for ;).